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

/
/
xgm

Test String

Code Generator

Language

Generated Code

use strict; my $str = '# OP\'s samples PA#N1.1#ADP1 PA#N1.1,1.2#ADP1,2 PA#N1#ADP4 PA#N1,2#ADP4 PA#N1,2.1,3#ADP1 PA#N1.1-3#ADP1 PA#N1.1- 3.2#ADP1,2 PA#NUAL,AZ,AN#FOP123 PA#N1.1-2.1,3.1#ADP#PUSH PA*N1.1*ADP PA* # The same with some spaces adde here and there PA# N 1.1 #ADP1 PA#N 1.1,1.2#ADP1,2 PA#N1#ADP4 PA#N1,2 #ADP4 PA#N1,2. 1,3#ADP1 PA#N1.1-3#ADP1 PA#N1.1- 3.2#ADP1,2 PA#NUAL,AZ,AN#FOP123 PA#N1.1-2 . 1 , 3 . 1 #ADP#PUSH PA*N1 .1*ADP PA#N1.1...#5#SOME TEXT '; my $regex = qr/^((?! # This and the final line allow invert the regex condition PA(?: \*(?:N\s*\d+\s*\.\s*\d+\s*\*ADP)? # match the asterisk cases | \#\s*N\s*\d+\s* # or the hash cases (?:[\.,-]\s*\d+\s*){0,5} \#ADP\s*(?:\d|\#PUSH) | \#NUAL,AZ,AN\#FOP\d # or the 'UAL,AZ,AN' literal ) ).)*$/xmp; 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