Regular Expressions 101

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An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

/
/
gm

Test String

Code Generator

Language

Generated Code

use strict; my $str = 'Sample 1: Equinox: *spamApTask1: Mar 20 15:26:04.033: #CAPWAP-3-ECHO_ERR: capwap_ac_sm.c:7019 Did not receive heartbeat reply; AP: 00:3a:9a:48:9b:40 Sample 2: Equinox: *spamReceiveTask: Mar 17 12:34:39.264: #CAPWAP-3-DTLS_CONN_ERR: capwap_ac.c:934 00:3a:9a:30:f5:90: DTLS connection not found forAP 192.168.99.74 (43456), Controller: 192.168.99.2 (5246) send packet Sample3: Equinox: *spamApTask1: Mar 22 08:35:14.562: #LWAPP-4-SIG_INFO1: spam_lrad.c:44474 Signature information; AP 00:14:1b:61:f8:40, alarm ON, standard sig NULL probe resp 1, track per-Macprecedence 2, hits 1, slot 0, channel 1, most offending MAC 00:00:00:00:00:00 #yes but must make Mac lowercase Sample 4: Equinox: *idsTrackEventTask: Mar 22 08:40:13.816: #WPS-4-SIG_ALARM_OFF: sig_event.c:656 AP 00:14:1B:61:F8:40 : Alarm OFF, standard sig NULL probe resp 1, track=per-Mac preced=2 hits=1 slot=0 channel=1 yes but must make Mac lowercase'; my $regex = qr/(?i)(?:[0-9a-f]{2}:){5}[0-9a-f]{2}/mp; if ( $str =~ /$regex/g ) { print "Whole match is ${^MATCH} and its start/end positions can be obtained via \$-[0] and \$+[0]\n"; # print "Capture Group 1 is $1 and its start/end positions can be obtained via \$-[1] and \$+[1]\n"; # print "Capture Group 2 is $2 ... and so on\n"; } # ${^POSTMATCH} and ${^PREMATCH} are also available with the use of '/p' # Named capture groups can be called via $+{name}

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Perl, please visit: http://perldoc.perl.org/perlre.html