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

r"
"
gmu

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

use strict; my $str = 'Room: 25m²", "I have eaten ¼ of the cake.'; my $regex = qr/[\u00B2\u00B3\u00B9\u00BC-\u00BE\u09F4-\u09F9\u0B72-\u0B77\u0BF0-\u0BF2\u0C78-\u0C7E\u0D58-\u0D5E\u0D70-\u0D78\u0F2A-\u0F33\u1369-\u137C\u17F0-\u17F9\u19DA\u2070\u2074-\u2079\u2080-\u2089\u2150-\u215F\u2189\u2460-\u249B\u24EA-\u24FF\u2776-\u2793\u2CFD\u3192-\u3195\u3220-\u3229\u3248-\u324F\u3251-\u325F\u3280-\u3289\u32B1-\u32BF\uA830-\uA835\U00010107-\U00010133\U00010175-\U00010178\U0001018A\U0001018B\U000102E1-\U000102FB\U00010320-\U00010323\U00010858-\U0001085F\U00010879-\U0001087F\U000108A7-\U000108AF\U000108FB-\U000108FF\U00010916-\U0001091B\U000109BC\U000109BD\U000109C0-\U000109CF\U000109D2-\U000109FF\U00010A40-\U00010A47\U00010A7D\U00010A7E\U00010A9D-\U00010A9F\U00010AEB-\U00010AEF\U00010B58-\U00010B5F\U00010B78-\U00010B7F\U00010BA9-\U00010BAF\U00010CFA-\U00010CFF\U00010E60-\U00010E7E\U00011052-\U00011065\U000111E1-\U000111F4\U0001173A\U0001173B\U000118EA-\U000118F2\U00011C5A-\U00011C6C\U00016B5B-\U00016B61\U0001D360-\U0001D371\U0001E8C7-\U0001E8CF\U0001F100-\U0001F10C\W\d_]+/mup; 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