Gecko [ www.utparral.edu.mx ]

Name	Size	Permission
asn1parse.1	10.95 KB	-rw-r--r--
autopoint.1	1.25 KB	-rw-r--r--
bmp2tiff.1	2.7 KB	-rw-r--r--
bsqldb.1	3.46 KB	-rw-r--r--
bsqlodbc.1	2.44 KB	-rw-r--r--
ca.1	32.7 KB	-rw-r--r--
CA.pl.1	12.08 KB	-rw-r--r--
ciphers.1	37.32 KB	-rw-r--r--
cjpeg.1	13.58 KB	-rw-r--r--
cms.1	31.95 KB	-rw-r--r--
corelist.1	9.57 KB	-rw-r--r--
cpan.1	13.56 KB	-rw-r--r--
c_rehash.1	8.57 KB	-rw-r--r--
crl.1	7.5 KB	-rw-r--r--
crl2pkcs7.1	7.27 KB	-rw-r--r--
curl.1	115.49 KB	-rw-r--r--
curl-config.1	4.1 KB	-rw-r--r--
cwebp.1	12.42 KB	-rw-r--r--
datacopy.1	2.49 KB	-rw-r--r--
dbilogstrip.1	5.25 KB	-r--r--r--
dbiprof.1	8.13 KB	-r--r--r--
dbiproxy.1	9.43 KB	-r--r--r--
defncopy.1	2.7 KB	-rw-r--r--
derb.1	4.8 KB	-rw-r--r--
dgst.1	11.63 KB	-rw-r--r--
dhparam.1	9.1 KB	-rw-r--r--
djpeg.1	7.57 KB	-rw-r--r--
dsa.1	9.78 KB	-rw-r--r--
dsaparam.1	7.82 KB	-rw-r--r--
dwebp.1	4.66 KB	-rw-r--r--
ec.1	10.64 KB	-rw-r--r--
ecparam.1	9.96 KB	-rw-r--r--
enc.1	19.46 KB	-rw-r--r--
enc2xs.1	12.59 KB	-rw-r--r--
encguess.1	6.07 KB	-rw-r--r--
engine.1	7.18 KB	-rw-r--r--
envsubst.1	1.79 KB	-rw-r--r--
errstr.1	4.97 KB	-rw-r--r--
fax2ps.1	4.62 KB	-rw-r--r--
fax2tiff.1	7.78 KB	-rw-r--r--
fisql.1	4.54 KB	-rw-r--r--
flex.1	3.63 KB	-rw-r--r--
freebcp.1	6.12 KB	-rw-r--r--
ftpasswd.1	916 B	-rw-r--r--
ftpcount.1	1.65 KB	-rw-r--r--
ftpmail.1	3.44 KB	-rw-r--r--
ftpquota.1	958 B	-rw-r--r--
ftptop.1	2.16 KB	-rw-r--r--
ftpwho.1	2.15 KB	-rw-r--r--
genbrk.1	2.89 KB	-rw-r--r--
gencfu.1	2.4 KB	-rw-r--r--
gencnval.1	2.34 KB	-rw-r--r--
gendict.1	3.32 KB	-rw-r--r--
gendsa.1	6.96 KB	-rw-r--r--
genpkey.1	15.69 KB	-rw-r--r--
genrb.1	3.82 KB	-rw-r--r--
genrsa.1	8.06 KB	-rw-r--r--
GET.1	9.36 KB	-r--r--r--
gettext.1	2.1 KB	-rw-r--r--
gettextize.1	1.5 KB	-rw-r--r--
gif2tiff.1	2.55 KB	-rw-r--r--
h2load.1	12.65 KB	-rw-r--r--
h2ph.1	7.53 KB	-rw-r--r--
h2xs.1	20.31 KB	-rw-r--r--
HEAD.1	9.36 KB	-r--r--r--
iconv.1	4.13 KB	-rw-r--r--
icu-config.1	7.28 KB	-rw-r--r--
instmodsh.1	4.27 KB	-r--r--r--
jpegtran.1	9.79 KB	-rw-r--r--
json_pp.1	6.88 KB	-rw-r--r--
ldapadd.1	8.66 KB	-rw-r--r--
ldapcompare.1	6.58 KB	-rw-r--r--
ldapdelete.1	6.61 KB	-rw-r--r--
ldapexop.1	6.06 KB	-rw-r--r--
ldapmodify.1	8.66 KB	-rw-r--r--
ldapmodrdn.1	6.78 KB	-rw-r--r--
ldappasswd.1	5.85 KB	-rw-r--r--
ldapsearch.1	13.99 KB	-rw-r--r--
ldapurl.1	4.05 KB	-rw-r--r--
ldapwhoami.1	4.91 KB	-rw-r--r--
libnetcfg.1	5.71 KB	-rw-r--r--
list.1	6.35 KB	-rw-r--r--
lwp-download.1	5.51 KB	-r--r--r--
lwp-mirror.1	4.95 KB	-r--r--r--
lwp-request.1	9.37 KB	-r--r--r--
lwp-rget.1	8.61 KB	-r--r--r--
makeconv.1	3.28 KB	-rw-r--r--
msgattrib.1	4.25 KB	-rw-r--r--
msgcat.1	4.22 KB	-rw-r--r--
msgcmp.1	2.23 KB	-rw-r--r--
msgcomm.1	3.98 KB	-rw-r--r--
msgconv.1	3.12 KB	-rw-r--r--
msgen.1	3.17 KB	-rw-r--r--
msgexec.1	2.1 KB	-rw-r--r--
msgfilter.1	3.67 KB	-rw-r--r--
msgfmt.1	5.93 KB	-rw-r--r--
msggrep.1	5.11 KB	-rw-r--r--
msginit.1	2.6 KB	-rw-r--r--
msgmerge.1	4.9 KB	-rw-r--r--
msgunfmt.1	3.91 KB	-rw-r--r--
msguniq.1	3.86 KB	-rw-r--r--
ngettext.1	2.14 KB	-rw-r--r--
nghttp.1	8.54 KB	-rw-r--r--
nghttpd.1	5.27 KB	-rw-r--r--
nghttpx.1	62.77 KB	-rw-r--r--
nseq.1	6.25 KB	-rw-r--r--
ocsp.1	23.59 KB	-rw-r--r--
openssl.1	21.09 KB	-rw-r--r--
openssl-asn1parse.1	10.95 KB	-rw-r--r--
openssl-ca.1	32.7 KB	-rw-r--r--
openssl-ciphers.1	37.32 KB	-rw-r--r--
openssl-cms.1	31.95 KB	-rw-r--r--
openssl-c_rehash.1	8.57 KB	-rw-r--r--
openssl-crl.1	7.5 KB	-rw-r--r--
openssl-crl2pkcs7.1	7.27 KB	-rw-r--r--
openssl-dgst.1	11.63 KB	-rw-r--r--
openssl-dhparam.1	9.1 KB	-rw-r--r--
openssl-dsa.1	9.78 KB	-rw-r--r--
openssl-dsaparam.1	7.82 KB	-rw-r--r--
openssl-ec.1	10.64 KB	-rw-r--r--
openssl-ecparam.1	9.96 KB	-rw-r--r--
openssl-enc.1	19.46 KB	-rw-r--r--
openssl-engine.1	7.18 KB	-rw-r--r--
openssl-errstr.1	4.97 KB	-rw-r--r--
openssl-gendsa.1	6.96 KB	-rw-r--r--
openssl-genpkey.1	15.69 KB	-rw-r--r--
openssl-genrsa.1	8.06 KB	-rw-r--r--
openssl-list.1	6.35 KB	-rw-r--r--
openssl-nseq.1	6.25 KB	-rw-r--r--
openssl-ocsp.1	23.59 KB	-rw-r--r--
openssl-passwd.1	7.18 KB	-rw-r--r--
openssl-pkcs12.1	17.9 KB	-rw-r--r--
openssl-pkcs7.1	7.11 KB	-rw-r--r--
openssl-pkcs8.1	15.66 KB	-rw-r--r--
openssl-pkey.1	8.81 KB	-rw-r--r--
openssl-pkeyparam.1	6.18 KB	-rw-r--r--
openssl-pkeyutl.1	15.88 KB	-rw-r--r--
openssl-prime.1	5.38 KB	-rw-r--r--
openssl-rand.1	6.68 KB	-rw-r--r--
openssl-rehash.1	8.57 KB	-rw-r--r--
openssl-req.1	29.78 KB	-rw-r--r--
openssl-rsa.1	10.42 KB	-rw-r--r--
openssl-rsautl.1	10.7 KB	-rw-r--r--
openssl-s_client.1	36.29 KB	-rw-r--r--
openssl-sess_id.1	8.86 KB	-rw-r--r--
openssl-smime.1	23.06 KB	-rw-r--r--
openssl-speed.1	7.02 KB	-rw-r--r--
openssl-spkac.1	8.53 KB	-rw-r--r--
openssl-srp.1	5.8 KB	-rw-r--r--
openssl-s_server.1	34.3 KB	-rw-r--r--
openssl-s_time.1	12.1 KB	-rw-r--r--
openssl-storeutl.1	7.48 KB	-rw-r--r--
openssl-ts.1	28.03 KB	-rw-r--r--
openssl-tsget.1	11.17 KB	-rw-r--r--
openssl-verify.1	33.23 KB	-rw-r--r--
openssl-version.1	5.36 KB	-rw-r--r--
openssl-x509.1	37.6 KB	-rw-r--r--
osql.1	2.07 KB	-rw-r--r--
pal2rgb.1	3.23 KB	-rw-r--r--
passwd.1	7.18 KB	-rw-r--r--
pcre-config.1	2.67 KB	-rw-r--r--
pcregrep.1	34.62 KB	-rw-r--r--
pcretest.1	48.1 KB	-rw-r--r--
perl.1	22.94 KB	-rw-r--r--
perl5004delta.1	72.94 KB	-rw-r--r--
perl5005delta.1	46.75 KB	-rw-r--r--
perl5100delta.1	74.08 KB	-rw-r--r--
perl5101delta.1	63.75 KB	-rw-r--r--
perl5120delta.1	114.62 KB	-rw-r--r--
perl5121delta.1	14.79 KB	-rw-r--r--
perl5122delta.1	14.99 KB	-rw-r--r--
perl5123delta.1	8.44 KB	-rw-r--r--
perl5124delta.1	7.97 KB	-rw-r--r--
perl5125delta.1	13.17 KB	-rw-r--r--
perl5140delta.1	172.4 KB	-rw-r--r--
perl5141delta.1	13.13 KB	-rw-r--r--
perl5142delta.1	12.09 KB	-rw-r--r--
perl5143delta.1	12.8 KB	-rw-r--r--
perl5144delta.1	11.68 KB	-rw-r--r--
perl5160delta.1	157 KB	-rw-r--r--
perl5161delta.1	10.71 KB	-rw-r--r--
perl5162delta.1	7.83 KB	-rw-r--r--
perl5163delta.1	8.44 KB	-rw-r--r--
perl5180delta.1	140.84 KB	-rw-r--r--
perl5181delta.1	11.06 KB	-rw-r--r--
perl5182delta.1	9.68 KB	-rw-r--r--
perl5184delta.1	8.88 KB	-rw-r--r--
perl5200delta.1	130.86 KB	-rw-r--r--
perl5201delta.1	15.78 KB	-rw-r--r--
perl5202delta.1	17.12 KB	-rw-r--r--
perl5203delta.1	14.02 KB	-rw-r--r--
perl5220delta.1	150.37 KB	-rw-r--r--
perl5221delta.1	15.59 KB	-rw-r--r--
perl5222delta.1	17.84 KB	-rw-r--r--
perl5223delta.1	13.16 KB	-rw-r--r--
perl5224delta.1	8.87 KB	-rw-r--r--
perl5240delta.1	77.32 KB	-rw-r--r--
perl5241delta.1	12.95 KB	-rw-r--r--
perl5242delta.1	8.54 KB	-rw-r--r--
perl5243delta.1	16.24 KB	-rw-r--r--
perl5244delta.1	8.98 KB	-rw-r--r--
perl5260delta.1	111.52 KB	-rw-r--r--
perl5261delta.1	12.66 KB	-rw-r--r--
perl5262delta.1	12.65 KB	-rw-r--r--
perl5263delta.1	11.33 KB	-rw-r--r--
perl5280delta.1	84.7 KB	-rw-r--r--
perl5281delta.1	9.09 KB	-rw-r--r--
perl5282delta.1	10.84 KB	-rw-r--r--
perl5283delta.1	9.63 KB	-rw-r--r--
perl5300delta.1	49.94 KB	-rw-r--r--
perl5301delta.1	10.21 KB	-rw-r--r--
perl5302delta.1	9.15 KB	-rw-r--r--
perl5303delta.1	9.51 KB	-rw-r--r--
perl5320delta.1	65.25 KB	-rw-r--r--
perl5321delta.1	11.58 KB	-rw-r--r--
perl5340delta.1	44.49 KB	-rw-r--r--
perl5341delta.1	8.27 KB	-rw-r--r--
perl561delta.1	156.54 KB	-rw-r--r--
perl56delta.1	136.21 KB	-rw-r--r--
perl581delta.1	48.95 KB	-rw-r--r--
perl582delta.1	9.06 KB	-rw-r--r--
perl583delta.1	11.52 KB	-rw-r--r--
perl584delta.1	13.05 KB	-rw-r--r--
perl585delta.1	10.35 KB	-rw-r--r--
perl586delta.1	9.2 KB	-rw-r--r--
perl587delta.1	13.86 KB	-rw-r--r--
perl588delta.1	34.69 KB	-rw-r--r--
perl589delta.1	70.59 KB	-rw-r--r--
perl58delta.1	132.11 KB	-rw-r--r--
perlaix.1	26.98 KB	-rw-r--r--
perlamiga.1	11.37 KB	-rw-r--r--
perlandroid.1	12.94 KB	-rw-r--r--
perlapi.1	901.39 KB	-rw-r--r--
perlapio.1	26.41 KB	-rw-r--r--
perlartistic.1	11.5 KB	-rw-r--r--
perlbook.1	14.63 KB	-rw-r--r--
perlboot.1	4.19 KB	-rw-r--r--
perlbot.1	4.2 KB	-rw-r--r--
perlbs2000.1	13.07 KB	-rw-r--r--
perlbug.1	15.89 KB	-rw-r--r--
perlcall.1	66.92 KB	-rw-r--r--
perlcheat.1	8.59 KB	-rw-r--r--
perlclib.1	14.84 KB	-rw-r--r--
perlcn.1	8.21 KB	-rw-r--r--
perlcommunity.1	11.48 KB	-rw-r--r--
perlcygwin.1	34.92 KB	-rw-r--r--
perldata.1	59.36 KB	-rw-r--r--
perldbmfilter.1	9.6 KB	-rw-r--r--
perldebguts.1	51.63 KB	-rw-r--r--
perldebtut.1	29.77 KB	-rw-r--r--
perldebug.1	51.21 KB	-rw-r--r--
perldelta.1	8.26 KB	-rw-r--r--
perldeprecation.1	29.46 KB	-rw-r--r--
perldiag.1	401.65 KB	-rw-r--r--
perldoc.1	15.24 KB	-rw-r--r--
perldocstyle.1	53.28 KB	-rw-r--r--
perldos.1	15.76 KB	-rw-r--r--
perldsc.1	32.83 KB	-rw-r--r--
perldtrace.1	13.28 KB	-rw-r--r--
perlebcdic.1	97.39 KB	-rw-r--r--
perlembed.1	45.84 KB	-rw-r--r--
perlexperiment.1	15.46 KB	-rw-r--r--
perlfaq.1	28.79 KB	-rw-r--r--
perlfaq1.1	19.18 KB	-rw-r--r--
perlfaq2.1	14.29 KB	-rw-r--r--
perlfaq3.1	47.17 KB	-rw-r--r--
perlfaq4.1	109.05 KB	-rw-r--r--
perlfaq5.1	67.54 KB	-rw-r--r--
perlfaq6.1	49.07 KB	-rw-r--r--
perlfaq7.1	46.93 KB	-rw-r--r--
perlfaq8.1	62.56 KB	-rw-r--r--
perlfaq9.1	21.11 KB	-rw-r--r--
perlfilter.1	28.15 KB	-rw-r--r--
perlfork.1	18.88 KB	-rw-r--r--
perlform.1	22.32 KB	-rw-r--r--
perlfreebsd.1	5.63 KB	-rw-r--r--
perlfunc.1	433.03 KB	-rw-r--r--
perlgit.1	38.47 KB	-rw-r--r--
perlglossary.1	160.35 KB	-rw-r--r--
perlgov.1	19.15 KB	-rw-r--r--
perlgpl.1	17.94 KB	-rw-r--r--
perlguts.1	195.97 KB	-rw-r--r--
perlhack.1	52.01 KB	-rw-r--r--
perlhacktips.1	68.2 KB	-rw-r--r--
perlhacktut.1	10.88 KB	-rw-r--r--
perlhaiku.1	5.37 KB	-rw-r--r--
perlhist.1	64.26 KB	-rw-r--r--
perlhpux.1	37.33 KB	-rw-r--r--
perlhurd.1	5.96 KB	-rw-r--r--
perlintern.1	113.25 KB	-rw-r--r--
perlinterp.1	42.17 KB	-rw-r--r--
perlintro.1	28.76 KB	-rw-r--r--
perliol.1	45.31 KB	-rw-r--r--
perlipc.1	81.15 KB	-rw-r--r--
perlirix.1	8.84 KB	-rw-r--r--
perlivp.1	7.07 KB	-rw-r--r--
perljp.1	10.94 KB	-rw-r--r--
perlko.1	12.65 KB	-rw-r--r--
perllexwarn.1	4.29 KB	-rw-r--r--
perllinux.1	6.01 KB	-rw-r--r--
perllocale.1	88.6 KB	-rw-r--r--
perllol.1	14.78 KB	-rw-r--r--
perlmacos.1	4.83 KB	-rw-r--r--
perlmacosx.1	16.85 KB	-rw-r--r--
perlmod.1	33.42 KB	-rw-r--r--
perlmodinstall.1	15.45 KB	-rw-r--r--
perlmodlib.1	102.87 KB	-rw-r--r--
perlmodstyle.1	28.83 KB	-rw-r--r--
perlmroapi.1	7.66 KB	-rw-r--r--
perlnetware.1	10.88 KB	-rw-r--r--
perlnewmod.1	16.12 KB	-rw-r--r--
perlnumber.1	13.46 KB	-rw-r--r--
perlobj.1	44.56 KB	-rw-r--r--
perlootut.1	34.2 KB	-rw-r--r--
perlop.1	176.42 KB	-rw-r--r--
perlopenbsd.1	5.1 KB	-rw-r--r--
perlopentut.1	20.99 KB	-rw-r--r--
perlos2.1	112.91 KB	-rw-r--r--
perlos390.1	22.36 KB	-rw-r--r--
perlos400.1	9.05 KB	-rw-r--r--
perlpacktut.1	62.27 KB	-rw-r--r--
perlperf.1	57.75 KB	-rw-r--r--
perlplan9.1	9.45 KB	-rw-r--r--
perlpod.1	30.4 KB	-rw-r--r--
perlpodspec.1	78.17 KB	-rw-r--r--
perlpodstyle.1	16.93 KB	-rw-r--r--
perlpolicy.1	30.73 KB	-rw-r--r--
perlport.1	102.33 KB	-rw-r--r--
perlpragma.1	9.81 KB	-rw-r--r--
perlqnx.1	11.23 KB	-rw-r--r--
perlre.1	157.04 KB	-rw-r--r--
perlreapi.1	39.56 KB	-rw-r--r--
perlrebackslash.1	42.01 KB	-rw-r--r--
perlrecharclass.1	61.97 KB	-rw-r--r--
perlref.1	42.85 KB	-rw-r--r--
perlreftut.1	24.7 KB	-rw-r--r--
perlreguts.1	47.94 KB	-rw-r--r--
perlrepository.1	4.38 KB	-rw-r--r--
perlrequick.1	26.79 KB	-rw-r--r--
perlreref.1	21.18 KB	-rw-r--r--
perlretut.1	148.4 KB	-rw-r--r--
perlriscos.1	5.32 KB	-rw-r--r--
perlrun.1	68.29 KB	-rw-r--r--
perlsec.1	33.86 KB	-rw-r--r--
perlsecpolicy.1	25.18 KB	-rw-r--r--
perlsolaris.1	36.49 KB	-rw-r--r--
perlsource.1	11.58 KB	-rw-r--r--
perlstyle.1	13.43 KB	-rw-r--r--
perlsub.1	89.54 KB	-rw-r--r--
perlsyn.1	59.69 KB	-rw-r--r--
perlsynology.1	12.64 KB	-rw-r--r--
perlthanks.1	15.89 KB	-rw-r--r--
perlthrtut.1	54.08 KB	-rw-r--r--
perltie.1	49.97 KB	-rw-r--r--
perltoc.1	1.25 MB	-rw-r--r--
perltodo.1	4.29 KB	-rw-r--r--
perltooc.1	4.19 KB	-rw-r--r--
perltoot.1	4.19 KB	-rw-r--r--
perltrap.1	16.35 KB	-rw-r--r--
perltru64.1	13.15 KB	-rw-r--r--
perltw.1	7.99 KB	-rw-r--r--
perlunicode.1	111.26 KB	-rw-r--r--
perlunicook.1	34.47 KB	-rw-r--r--
perlunifaq.1	21.16 KB	-rw-r--r--
perluniintro.1	47.32 KB	-rw-r--r--
perluniprops.1	464.67 KB	-rw-r--r--
perlunitut.1	12.78 KB	-rw-r--r--
perlutil.1	12.01 KB	-rw-r--r--
perlvar.1	103.45 KB	-rw-r--r--
perlvms.1	61.19 KB	-rw-r--r--
perlvos.1	7.87 KB	-rw-r--r--
perlwin32.1	46.69 KB	-rw-r--r--
perlxs.1	101.28 KB	-rw-r--r--
perlxstut.1	62.05 KB	-rw-r--r--
perlxstypemap.1	31.37 KB	-rw-r--r--
piconv.1	7.58 KB	-rw-r--r--
pkcs12.1	17.9 KB	-rw-r--r--
pkcs7.1	7.11 KB	-rw-r--r--
pkcs8.1	15.66 KB	-rw-r--r--
pkey.1	8.81 KB	-rw-r--r--
pkeyparam.1	6.18 KB	-rw-r--r--
pkeyutl.1	15.88 KB	-rw-r--r--
pkgdata.1	6.92 KB	-rw-r--r--
pl2pm.1	4.53 KB	-rw-r--r--
pod2html.1	9.03 KB	-rw-r--r--
pod2man.1	18.18 KB	-rw-r--r--
pod2text.1	13.17 KB	-rw-r--r--
pod2usage.1	6.74 KB	-rw-r--r--
podchecker.1	6.06 KB	-rw-r--r--
POST.1	9.36 KB	-r--r--r--
ppm2tiff.1	2.9 KB	-rw-r--r--
prime.1	5.38 KB	-rw-r--r--
prove.1	20.1 KB	-rw-r--r--
ptar.1	5.02 KB	-rw-r--r--
ptardiff.1	4.86 KB	-rw-r--r--
ptargrep.1	6.01 KB	-rw-r--r--
rand.1	6.68 KB	-rw-r--r--
ras2tiff.1	2.94 KB	-rw-r--r--
raw2tiff.1	5.32 KB	-rw-r--r--
rdjpgcom.1	1.66 KB	-rw-r--r--
recode-sr-latin.1	1.25 KB	-rw-r--r--
rehash.1	8.57 KB	-rw-r--r--
req.1	29.78 KB	-rw-r--r--
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.\" ========================================================================
.\"
.IX Title "PERLREREF 1"
.TH PERLREREF 1 "2022-02-19" "perl v5.34.1" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
perlreref \- Perl Regular Expressions Reference
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This is a quick reference to Perl's regular expressions.
For full information see perlre and perlop, as well
as the \*(L"\s-1SEE ALSO\*(R"\s0 section in this document.
.SS "\s-1OPERATORS\s0"
.IX Subsection "OPERATORS"
\&\f(CW\*(C`=~\*(C'\fR determines to which variable the regex is applied.
In its absence, \f(CW$_\fR is used.
.PP
.Vb 1
\&    $var =~ /foo/;
.Ve
.PP
\&\f(CW\*(C`!~\*(C'\fR determines to which variable the regex is applied,
and negates the result of the match; it returns
false if the match succeeds, and true if it fails.
.PP
.Vb 1
\&    $var !~ /foo/;
.Ve
.PP
\&\f(CW\*(C`m/pattern/msixpogcdualn\*(C'\fR searches a string for a pattern match,
applying the given options.
.PP
.Vb 10
\&    m  Multiline mode \- ^ and $ match internal lines
\&    s  match as a Single line \- . matches \en
\&    i  case\-Insensitive
\&    x  eXtended legibility \- free whitespace and comments
\&    p  Preserve a copy of the matched string \-
\&       ${^PREMATCH}, ${^MATCH}, ${^POSTMATCH} will be defined.
\&    o  compile pattern Once
\&    g  Global \- all occurrences
\&    c  don\*(Aqt reset pos on failed matches when using /g
\&    a  restrict \ed, \es, \ew and [:posix:] to match ASCII only
\&    aa (two a\*(Aqs) also /i matches exclude ASCII/non\-ASCII
\&    l  match according to current locale
\&    u  match according to Unicode rules
\&    d  match according to native rules unless something indicates
\&       Unicode
\&    n  Non\-capture mode. Don\*(Aqt let () fill in $1, $2, etc...
.Ve
.PP
If 'pattern' is an empty string, the last \fIsuccessfully\fR matched
regex is used. Delimiters other than '/' may be used for both this
operator and the following ones. The leading \f(CW\*(C`m\*(C'\fR can be omitted
if the delimiter is '/'.
.PP
\&\f(CW\*(C`qr/pattern/msixpodualn\*(C'\fR lets you store a regex in a variable,
or pass one around. Modifiers as for \f(CW\*(C`m//\*(C'\fR, and are stored
within the regex.
.PP
\&\f(CW\*(C`s/pattern/replacement/msixpogcedual\*(C'\fR substitutes matches of
\&'pattern' with 'replacement'. Modifiers as for \f(CW\*(C`m//\*(C'\fR,
with two additions:
.PP
.Vb 2
\&    e  Evaluate \*(Aqreplacement\*(Aq as an expression
\&    r  Return substitution and leave the original string untouched.
.Ve
.PP
\&'e' may be specified multiple times. 'replacement' is interpreted
as a double quoted string unless a single-quote (\f(CW\*(C`\*(Aq\*(C'\fR) is the delimiter.
.PP
\&\f(CW\*(C`m?pattern?\*(C'\fR is like \f(CW\*(C`m/pattern/\*(C'\fR but matches only once. No alternate
delimiters can be used.  Must be reset with \fBreset()\fR.
.SS "\s-1SYNTAX\s0"
.IX Subsection "SYNTAX"
.Vb 10
\& \e       Escapes the character immediately following it
\& .       Matches any single character except a newline (unless /s is
\&           used)
\& ^       Matches at the beginning of the string (or line, if /m is used)
\& $       Matches at the end of the string (or line, if /m is used)
\& *       Matches the preceding element 0 or more times
\& +       Matches the preceding element 1 or more times
\& ?       Matches the preceding element 0 or 1 times
\& {...}   Specifies a range of occurrences for the element preceding it
\& [...]   Matches any one of the characters contained within the brackets
\& (...)   Groups subexpressions for capturing to $1, $2...
\& (?:...) Groups subexpressions without capturing (cluster)
\& |       Matches either the subexpression preceding or following it
\& \eg1 or \eg{1}, \eg2 ...    Matches the text from the Nth group
\& \e1, \e2, \e3 ...           Matches the text from the Nth group
\& \eg\-1 or \eg{\-1}, \eg\-2 ... Matches the text from the Nth previous group
\& \eg{name}     Named backreference
\& \ek<name>     Named backreference
\& \ek\*(Aqname\*(Aq     Named backreference
\& (?P=name)    Named backreference (python syntax)
.Ve
.SS "\s-1ESCAPE SEQUENCES\s0"
.IX Subsection "ESCAPE SEQUENCES"
These work as in normal strings.
.PP
.Vb 10
\&   \ea       Alarm (beep)
\&   \ee       Escape
\&   \ef       Formfeed
\&   \en       Newline
\&   \er       Carriage return
\&   \et       Tab
\&   \e037     Char whose ordinal is the 3 octal digits, max \e777
\&   \eo{2307} Char whose ordinal is the octal number, unrestricted
\&   \ex7f     Char whose ordinal is the 2 hex digits, max \exFF
\&   \ex{263a} Char whose ordinal is the hex number, unrestricted
\&   \ecx      Control\-x
\&   \eN{name} A named Unicode character or character sequence
\&   \eN{U+263D} A Unicode character by hex ordinal
\&
\&   \el  Lowercase next character
\&   \eu  Titlecase next character
\&   \eL  Lowercase until \eE
\&   \eU  Uppercase until \eE
\&   \eF  Foldcase until \eE
\&   \eQ  Disable pattern metacharacters until \eE
\&   \eE  End modification
.Ve
.PP
For Titlecase, see \*(L"Titlecase\*(R".
.PP
This one works differently from normal strings:
.PP
.Vb 1
\&   \eb  An assertion, not backspace, except in a character class
.Ve
.SS "\s-1CHARACTER CLASSES\s0"
.IX Subsection "CHARACTER CLASSES"
.Vb 4
\&   [amy]    Match \*(Aqa\*(Aq, \*(Aqm\*(Aq or \*(Aqy\*(Aq
\&   [f\-j]    Dash specifies "range"
\&   [f\-j\-]   Dash escaped or at start or end means \*(Aqdash\*(Aq
\&   [^f\-j]   Caret indicates "match any character _except_ these"
.Ve
.PP
The following sequences (except \f(CW\*(C`\eN\*(C'\fR) work within or without a character class.
The first six are locale aware, all are Unicode aware. See perllocale
and perlunicode for details.
.PP
.Vb 10
\&   \ed      A digit
\&   \eD      A nondigit
\&   \ew      A word character
\&   \eW      A non\-word character
\&   \es      A whitespace character
\&   \eS      A non\-whitespace character
\&   \eh      A horizontal whitespace
\&   \eH      A non horizontal whitespace
\&   \eN      A non newline (when not followed by \*(Aq{NAME}\*(Aq;;
\&           not valid in a character class; equivalent to [^\en]; it\*(Aqs
\&           like \*(Aq.\*(Aq without /s modifier)
\&   \ev      A vertical whitespace
\&   \eV      A non vertical whitespace
\&   \eR      A generic newline           (?>\ev|\ex0D\ex0A)
\&
\&   \epP     Match P\-named (Unicode) property
\&   \ep{...} Match Unicode property with name longer than 1 character
\&   \ePP     Match non\-P
\&   \eP{...} Match lack of Unicode property with name longer than 1 char
\&   \eX      Match Unicode extended grapheme cluster
.Ve
.PP
\&\s-1POSIX\s0 character classes and their Unicode and Perl equivalents:
.PP
.Vb 3
\&            ASCII\-         Full\-
\&   POSIX    range          range    backslash
\& [[:...:]]  \ep{...}        \ep{...}   sequence    Description
\&
\& \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
\& alnum   PosixAlnum       XPosixAlnum            \*(Aqalpha\*(Aq plus \*(Aqdigit\*(Aq
\& alpha   PosixAlpha       XPosixAlpha            Alphabetic characters
\& ascii   ASCII                                   Any ASCII character
\& blank   PosixBlank       XPosixBlank   \eh       Horizontal whitespace;
\&                                                   full\-range also
\&                                                   written as
\&                                                   \ep{HorizSpace} (GNU
\&                                                   extension)
\& cntrl   PosixCntrl       XPosixCntrl            Control characters
\& digit   PosixDigit       XPosixDigit   \ed       Decimal digits
\& graph   PosixGraph       XPosixGraph            \*(Aqalnum\*(Aq plus \*(Aqpunct\*(Aq
\& lower   PosixLower       XPosixLower            Lowercase characters
\& print   PosixPrint       XPosixPrint            \*(Aqgraph\*(Aq plus \*(Aqspace\*(Aq,
\&                                                   but not any Controls
\& punct   PosixPunct       XPosixPunct            Punctuation and Symbols
\&                                                   in ASCII\-range; just
\&                                                   punct outside it
\& space   PosixSpace       XPosixSpace   \es       Whitespace
\& upper   PosixUpper       XPosixUpper            Uppercase characters
\& word    PosixWord        XPosixWord    \ew       \*(Aqalnum\*(Aq + Unicode marks
\&                                                    + connectors, like
\&                                                    \*(Aq_\*(Aq (Perl extension)
\& xdigit  ASCII_Hex_Digit  XPosixDigit            Hexadecimal digit,
\&                                                    ASCII\-range is
\&                                                    [0\-9A\-Fa\-f]
.Ve
.PP
Also, various synonyms like \f(CW\*(C`\ep{Alpha}\*(C'\fR for \f(CW\*(C`\ep{XPosixAlpha}\*(C'\fR; all listed
in \*(L"Properties accessible through \ep{} and \eP{}\*(R" in perluniprops
.PP
Within a character class:
.PP
.Vb 3
\&    POSIX      traditional   Unicode
\&  [:digit:]       \ed        \ep{Digit}
\&  [:^digit:]      \eD        \eP{Digit}
.Ve
.SS "\s-1ANCHORS\s0"
.IX Subsection "ANCHORS"
All are zero-width assertions.
.PP
.Vb 11
\&   ^  Match string start (or line, if /m is used)
\&   $  Match string end (or line, if /m is used) or before newline
\&   \eb{} Match boundary of type specified within the braces
\&   \eB{} Match wherever \eb{} doesn\*(Aqt match
\&   \eb Match word boundary (between \ew and \eW)
\&   \eB Match except at word boundary (between \ew and \ew or \eW and \eW)
\&   \eA Match string start (regardless of /m)
\&   \eZ Match string end (before optional newline)
\&   \ez Match absolute string end
\&   \eG Match where previous m//g left off
\&   \eK Keep the stuff left of the \eK, don\*(Aqt include it in $&
.Ve
.SS "\s-1QUANTIFIERS\s0"
.IX Subsection "QUANTIFIERS"
Quantifiers are greedy by default and match the \fBlongest\fR leftmost.
.PP
.Vb 10
\&   Maximal Minimal Possessive Allowed range
\&   \-\-\-\-\-\-\- \-\-\-\-\-\-\- \-\-\-\-\-\-\-\-\-\- \-\-\-\-\-\-\-\-\-\-\-\-\-
\&   {n,m}   {n,m}?  {n,m}+     Must occur at least n times
\&                              but no more than m times
\&   {n,}    {n,}?   {n,}+      Must occur at least n times
\&   {,n}    {,n}?   {,n}+      Must occur at most n times
\&   {n}     {n}?    {n}+       Must occur exactly n times
\&   *       *?      *+         0 or more times (same as {0,})
\&   +       +?      ++         1 or more times (same as {1,})
\&   ?       ??      ?+         0 or 1 time (same as {0,1})
.Ve
.PP
The possessive forms (new in Perl 5.10) prevent backtracking: what gets
matched by a pattern with a possessive quantifier will not be backtracked
into, even if that causes the whole match to fail.
.SS "\s-1EXTENDED CONSTRUCTS\s0"
.IX Subsection "EXTENDED CONSTRUCTS"
.Vb 10
\&   (?#text)          A comment
\&   (?:...)           Groups subexpressions without capturing (cluster)
\&   (?pimsx\-imsx:...) Enable/disable option (as per m// modifiers)
\&   (?=...)           Zero\-width positive lookahead assertion
\&   (*pla:...)        Same, starting in 5.32; experimentally in 5.28
\&   (*positive_lookahead:...) Same, same versions as *pla
\&   (?!...)           Zero\-width negative lookahead assertion
\&   (*nla:...)        Same, starting in 5.32; experimentally in 5.28
\&   (*negative_lookahead:...) Same, same versions as *nla
\&   (?<=...)          Zero\-width positive lookbehind assertion
\&   (*plb:...)        Same, starting in 5.32; experimentally in 5.28
\&   (*positive_lookbehind:...) Same, same versions as *plb
\&   (?<!...)          Zero\-width negative lookbehind assertion
\&   (*nlb:...)        Same, starting in 5.32; experimentally in 5.28
\&   (*negative_lookbehind:...) Same, same versions as *plb
\&   (?>...)           Grab what we can, prohibit backtracking
\&   (*atomic:...)     Same, starting in 5.32; experimentally in 5.28
\&   (?|...)           Branch reset
\&   (?<name>...)      Named capture
\&   (?\*(Aqname\*(Aq...)      Named capture
\&   (?P<name>...)     Named capture (python syntax)
\&   (?[...])          Extended bracketed character class
\&   (?{ code })       Embedded code, return value becomes $^R
\&   (??{ code })      Dynamic regex, return value used as regex
\&   (?N)              Recurse into subpattern number N
\&   (?\-N), (?+N)      Recurse into Nth previous/next subpattern
\&   (?R), (?0)        Recurse at the beginning of the whole pattern
\&   (?&name)          Recurse into a named subpattern
\&   (?P>name)         Recurse into a named subpattern (python syntax)
\&   (?(cond)yes|no)
\&   (?(cond)yes)      Conditional expression, where "(cond)" can be:
\&                     (?=pat)   lookahead; also (*pla:pat)
\&                               (*positive_lookahead:pat)
\&                     (?!pat)   negative lookahead; also (*nla:pat)
\&                               (*negative_lookahead:pat)
\&                     (?<=pat)  lookbehind; also (*plb:pat)
\&                               (*lookbehind:pat)
\&                     (?<!pat)  negative lookbehind; also (*nlb:pat)
\&                               (*negative_lookbehind:pat)
\&                     (N)       subpattern N has matched something
\&                     (<name>)  named subpattern has matched something
\&                     (\*(Aqname\*(Aq)  named subpattern has matched something
\&                     (?{code}) code condition
\&                     (R)       true if recursing
\&                     (RN)      true if recursing into Nth subpattern
\&                     (R&name)  true if recursing into named subpattern
\&                     (DEFINE)  always false, no no\-pattern allowed
.Ve
.SS "\s-1VARIABLES\s0"
.IX Subsection "VARIABLES"
.Vb 1
\&   $_    Default variable for operators to use
\&
\&   $\`    Everything prior to matched string
\&   $&    Entire matched string
\&   $\*(Aq    Everything after to matched string
\&
\&   ${^PREMATCH}   Everything prior to matched string
\&   ${^MATCH}      Entire matched string
\&   ${^POSTMATCH}  Everything after to matched string
.Ve
.PP
Note to those still using Perl 5.18 or earlier:
The use of \f(CW\*(C`$\`\*(C'\fR, \f(CW$&\fR or \f(CW\*(C`$\*(Aq\*(C'\fR will slow down \fBall\fR regex use
within your program. Consult perlvar for \f(CW\*(C`@\-\*(C'\fR
to see equivalent expressions that won't cause slow down.
See also Devel::SawAmpersand. Starting with Perl 5.10, you
can also use the equivalent variables \f(CW\*(C`${^PREMATCH}\*(C'\fR, \f(CW\*(C`${^MATCH}\*(C'\fR
and \f(CW\*(C`${^POSTMATCH}\*(C'\fR, but for them to be defined, you have to
specify the \f(CW\*(C`/p\*(C'\fR (preserve) modifier on your regular expression.
In Perl 5.20, the use of \f(CW\*(C`$\`\*(C'\fR, \f(CW$&\fR and \f(CW\*(C`$\*(Aq\*(C'\fR makes no speed difference.
.PP
.Vb 8
\&   $1, $2 ...  hold the Xth captured expr
\&   $+    Last parenthesized pattern match
\&   $^N   Holds the most recently closed capture
\&   $^R   Holds the result of the last (?{...}) expr
\&   @\-    Offsets of starts of groups. $\-[0] holds start of whole match
\&   @+    Offsets of ends of groups. $+[0] holds end of whole match
\&   %+    Named capture groups
\&   %\-    Named capture groups, as array refs
.Ve
.PP
Captured groups are numbered according to their \fIopening\fR paren.
.SS "\s-1FUNCTIONS\s0"
.IX Subsection "FUNCTIONS"
.Vb 5
\&   lc          Lowercase a string
\&   lcfirst     Lowercase first char of a string
\&   uc          Uppercase a string
\&   ucfirst     Titlecase first char of a string
\&   fc          Foldcase a string
\&
\&   pos         Return or set current match position
\&   quotemeta   Quote metacharacters
\&   reset       Reset m?pattern? status
\&   study       Analyze string for optimizing matching
\&
\&   split       Use a regex to split a string into parts
.Ve
.PP
The first five of these are like the escape sequences \f(CW\*(C`\eL\*(C'\fR, \f(CW\*(C`\el\*(C'\fR,
\&\f(CW\*(C`\eU\*(C'\fR, \f(CW\*(C`\eu\*(C'\fR, and \f(CW\*(C`\eF\*(C'\fR.  For Titlecase, see \*(L"Titlecase\*(R"; For
Foldcase, see \*(L"Foldcase\*(R".
.SS "\s-1TERMINOLOGY\s0"
.IX Subsection "TERMINOLOGY"
\fITitlecase\fR
.IX Subsection "Titlecase"
.PP
Unicode concept which most often is equal to uppercase, but for
certain characters like the German \*(L"sharp s\*(R" there is a difference.
.PP
\fIFoldcase\fR
.IX Subsection "Foldcase"
.PP
Unicode form that is useful when comparing strings regardless of case,
as certain characters have complex one-to-many case mappings. Primarily a
variant of lowercase.
.SH "AUTHOR"
.IX Header "AUTHOR"
Iain Truskett. Updated by the Perl 5 Porters.
.PP
This document may be distributed under the same terms as Perl itself.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
.IP "\(bu" 4
perlretut for a tutorial on regular expressions.
.IP "\(bu" 4
perlrequick for a rapid tutorial.
.IP "\(bu" 4
perlre for more details.
.IP "\(bu" 4
perlvar for details on the variables.
.IP "\(bu" 4
perlop for details on the operators.
.IP "\(bu" 4
perlfunc for details on the functions.
.IP "\(bu" 4
perlfaq6 for FAQs on regular expressions.
.IP "\(bu" 4
perlrebackslash for a reference on backslash sequences.
.IP "\(bu" 4
perlrecharclass for a reference on character classes.
.IP "\(bu" 4
The re module to alter behaviour and aid
debugging.
.IP "\(bu" 4
\&\*(L"Debugging Regular Expressions\*(R" in perldebug
.IP "\(bu" 4
perluniintro, perlunicode, charnames and perllocale
for details on regexes and internationalisation.
.IP "\(bu" 4
\&\fIMastering Regular Expressions\fR by Jeffrey Friedl
(<http://oreilly.com/catalog/9780596528126/>) for a thorough grounding and
reference on the topic.
.SH "THANKS"
.IX Header "THANKS"
David P.C. Wollmann,
Richard Soderberg,
Sean M. Burke,
Tom Christiansen,
Jim Cromie,
and
Jeffrey Goff
for useful advice.

${this.title}

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