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 = 'Format which I need: 2019-11-10 15:22:32.662 +0300 (Default,mydzit.gov.sa\\kalsolai,4C8EC4A70F3149988B93370B16CADBEE-0:0,XcgBCNSpBpjM51ezrQYXrQAAAgE) catalina-exec-150 : INFO wgsessionId=rd9xUhIUR92tuPbGQkZrNQ com.tableausoftware.domain.session.SessionService - Non-guest user session found. AND: 2019-11-10 15:22:40.816 +0300 (Default,mydzit.gov.sa\\kalsolai,F853E8F10C2742CBB071A090C3047519-0:0,XcgBENSpBpjM51ezrQYXvwAAAZE) catalina-exec-151 : INFO wgsessionId=rd9xUhIUR92tuPbGQkZrNQ com.tableausoftware.model.vizql.util.WithSessionAspect - Command not allowed on a shared session F853E8F10C2742CBB071A090C3047519. Cloning to a private session and retrying. Format which no need: first form: { [-] k: msg pid: 37552 req: - sess: - sev: info site: - tid: 4958 ts: 2019-11-06T17:06:06.305 user: - v: Resource Manager: Memory info: 73,793,536 bytes (current process);52,410,015,744 bytes (Tableau total); 49,979,158,528 bytes (total of all processes); 30 (info count) } Second Form: {"ts":"2019-11-06T17:06:06.305","pid":37552,"tid":"4958","sev":"info","req":"-","sess":"-","site":"-","user":"-","k":"msg","v":"Resource Manager: Memory info: 73,793,536 bytes (current process);52,410,015,744 bytes (Tableau total); 49,979,158,528 bytes (total of all processes); 30 (info count)"}'; my $regex = qr/(?ms)pid.*?req/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