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 = 'Accord.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 3.8.0 File Version: 3.8.0.6134 Creation Date: 01/29/2019 12:58:20 Accord.Video.DirectShow.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 3.8.0 File Version: 3.8.0.6134 Creation Date: 01/29/2019 12:58:20 Accord.Video.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 3.8.0 File Version: 3.8.0.6134 Creation Date: 01/29/2019 12:58:20 Advantech.Adam.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 7.2.0.0 File Version: 7.2.0.0 Creation Date: 09/03/2018 16:48:40 Advantech.Common.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 7.2.0.0 File Version: 7.2.0.0 Creation Date: 09/03/2018 16:48:40 Advantech.Protocol.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 7.2.0.0 File Version: 7.2.0.0 Creation Date: 09/03/2018 16:48:40 Autofac.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 4.8.1 File Version: 4.8.1.0 Creation Date: 01/29/2019 12:58:20 Autofac.Integration.Owin.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 4.2.0-CI-247 File Version: 4.2.0.247 Creation Date: 01/29/2019 12:58:20 Autofac.Integration.SignalR.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 4.0.0-CI-228 File Version: 4.0.0.228 Creation Date: 01/29/2019 12:58:20 Autofac.Integration.WebApi.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 4.0.0-CI-229 File Version: 4.0.0.229 Creation Date: 01/29/2019 12:58:20 Autofac.Integration.WebApi.Owin.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 4.0.0-CI-226 File Version: 4.0.0.226 Creation Date: 01/29/2019 12:58:20 DirectShowLib-2005.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 2.1.0.0 File Version: 2.1.0.0 Creation Date: 09/03/2018 16:48:40 DTKANPR.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 1.3.34 File Version: 1.3.34 Creation Date: 09/03/2018 16:48:40 DTKRES1.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 1.3.34 File Version: 1.3.34 Creation Date: 09/03/2018 16:48:40 Dynamitey.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 2.0.9.136 File Version: 2.0.9.136 Creation Date: 01/29/2019 12:58:20 Fasterflect.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 2.1.3 File Version: 2.1.3 Creation Date: 01/29/2019 12:58:20 ImpromptuInterface.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 7.0.1 File Version: 7.0.1.0 Creation Date: 01/29/2019 12:58:20 inpout32.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 1, 5, 0, 0 File Version: 1, 5, 0, 0 Creation Date: 09/03/2018 16:48:40 inpoutx64.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 1, 5, 0, 0 File Version: 1, 5, 0, 0 Creation Date: 09/03/2018 16:48:40 JetBrains.Annotations.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 2018.2.1 File Version: 2018.2.1.0 Creation Date: 01/29/2019 12:58:20 log4net.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 2.0.8.0-.NET 4.5 File Version: 2.0.8.0 Creation Date: 01/29/2019 12:58:20 vjsnativ.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 2.0.50727.937 File Version: 2.0.50727.937 (jsertm.050727-9300) Creation Date: 09/03/2018 16:48:40 vjssupuilib.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 2.0.50727.937 File Version: 2.0.50727.937 (jsertm.050727-9300) Creation Date: 09/03/2018 16:48:42 vjsvwaux.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 2.0.50727.937 File Version: 2.0.50727.937 (jsertm.050727-9300) Creation Date: 09/03/2018 16:48:40 vjswfc.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 2.0.50727.937 File Version: 2.0.50727.937 (jsertm.050727-9300) Creation Date: 09/03/2018 16:48:42 VJSWfcBrowserStubLib.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 2.0.50727.937 File Version: 2.0.50727.937 (jsertm.050727-9300) Creation Date: 09/03/2018 16:48:40 vjswfccw.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 2.0.50727.937 File Version: 2.0.50727.937 (jsertm.050727-9300) Creation Date: 09/03/2018 16:48:40 vjswfchtml.dll Directory: C:\\Program Files (x86)\\TheApp\\Hardware Product Version: 2.0.50727.937 File Version: 2.0.50727.937 (jsertm.050727-9300) Creation Date: 09/03/2018 16:48:42 '; my $regex = qr/((?:.+\R){5})/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