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 = '[2020-05-28 16:01:47.868 +00:00] CurrentTime=5/28/2020 4:01:47 PM +00:00;StartTime=5/28/2020 4:01:47 PM +00:00;EndTime=5/28/2020 4:01:47 PM +00:00;EventClass=QUERY_END;EventSubclass=1;Severity=0;Success=1;Error=0;ConnectionID=2804894;ClientProcessID=4364;SPID=12255472;ErrorType=0;Duration=78;CPUTime=78;IntegerData=5;TextData=select [LAST_SCHEMA_UPDATE],[LAST_DATA_UPDATE] from $system.mdschema_cubes where ([CATALOG_NAME]=@p1);NTCanonicalUserName=xxx\\xxx;SessionID=F1E0DF9C-E2B2-48BD-BFF4-FB57D3868BC6;NTUserName=xxx;NTDomainName=xxxx;DatabaseName=xxx;ApplicationName=PowerBI - Model Change Tracker - Id 5902431 - Last Check 05/28/2020 00:31:26;ServerName=xxx\\xxx;RequestID=xxx-97d8-4259-a0aa-xxx;RequestID=xxxx-a430-418f-898a-37282d0ee2df[0];RequestID=xxxx-d7ed-4401-9856-c974c21017c2[24];'; my $regex = qr/TextData=(?P<Query>[\w\W]*);NTCanonicalUserName/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