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

Substitution

Processing...

Code Generator

Language

Generated Code

use strict; my $str = '{"method":"GET","path":"/REDACTED","format":"json","controller":"REDACTED","action":"validate_token","status":200,"duration":30.26,"view":2.67,"db":5.88,"pid":10109,"sql_queries":"\' = 65593\\nUser Load (0.86) SELECT `users`.* FROM `users` WHERE `users`.`id` 3:59:58\', `tokens` = \'{\\\\\\"REDACTED\\\\\\":{\\\\\\"token\\\\\\":\\\\\\"REDACTED/W\\\\\\",\\\\\\"expiry\\\\\\":1550795150},\\\\\\"REDACTED\\\\\\":{\\\\\\"token\\\\\\":\\\\\\"REDACTED/\\\\\\",\\\\\\"expiry\\\\\\":1550795151},\\\\\\"REDACTED\\\\\\":{\\\\\\"token\\\\\\":\\\\\\REDACTED\\\\",\\\\\\"expiry\\\\\\":1550795151},\\\\\\"REDACTED\\\\\\":{\\\\\\"token\\\\\\":\\\\\\"REDACTED\\\\\\",\\\\\\"expiry\\\\\\":1550795152},\\\\\\"REDACTED\\\\\\":{\\\\\\"token\\\\\\":\\\\\\"$REDACTED\\\\\\",\\\\\\"expiry\\\\\\":1550795152},\\\\\\"REDACTED-g\\\\\\":{\\\\\\"token\\\\\\":\\\\\\"$REDACTED\\\\\\",\\\\\\"expiry\\\\\\":1550795153},\\\\\\"REDACTED\\\\\\":{\\\\\\"token\\\\\\":\\\\\\"REDACTED\\\\\\",\\\\\\"expiry\\\\\\":1550795154},\\\\\\"REDACTED\\\\\\":{\\\\\\"token\\\\\\":\\\\\\"REDACTED\\\\\\",\\\\\\"expiry\\\\\\":1550800798}}\' WHERE `users`.`id` = 65593\\n (0.98) COMMIT\'","@timestamp":"2019-02-21T23:59:58.015Z","@version":"1","message":"[200] GET / "}'; my $regex = qr/,"sql_queries":".*?,"/mp; my $subst = ' '; my $result = $str =~ s/$regex/$subst/rg; print "The result of the substitution is' $result\n";

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