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 = 'A1|A2|A3|A4|A5|A6|A7|A8|A9|A10|A11|A12|A13|A14|A15|A16|AA B1|B2|B3|B4|B5|B6|B7|B8|B9|B10|B11|B12|B13|B14|B15|AA C1|C2|C3|C4|C5|C6|C7|C8|C9|C10|C11|C12|C13|C14|AA D1|D2|D3|D4|D5|D6|D7|D8|D9|D10|D11|D12|D13|AA E1|E2|E3|E4|E5|E6|E7|E8|E9|E10|E11|E12|AA '; my $regex = qr/(?:^(?:[^|\r\n]*\|){10}[^|\r\n]*\K\||(?!^)\G[^|\r\n]*\K\|)(?=.*(?:\|[^|\r\n]*){2}$)/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