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

/
/
gsx

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

use strict; my $str = 'Hello Colm "This is a test\\\\\\\\" "This is also an NL test" \'And this has an escaped quote don\\\'t in it \' Blue Boy "This has a single quote \' but doesn\\\' end the quote as it started with double quotes" "line spanning with escaped quote at the end of a line\\" " "Foo Bar" "Another Value" something else "2005014523","34.95661","-96.74025","1","52","52","5/17/2020 - 11:10 AM","By 5/17/2020 2:38 PM","5/17/2020 - 12:50 PM","UNPLANNED" Empty? "" Empty, line spanning " " '; my $regex = qr/(['"])((?:(?!\1|\\).|\\.)*)\1/sxp; my $subst = 'Subbed'; 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