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
Processing...

Test String

Code Generator

Language

Generated Code

use strict; my $str = 'CHE-459.288.946 IDI n. CHE-459.288.946 CHE 459.288.946 PI:01924110289 CF BGGLNI40S20I008I LV12345678901 12345678901'; my $regex = qr/(?:(AT)\s*(U[0-9]{8}))|(?:(BE)\s*(0?[0-9]{*}))|(?:(CZ)\s*([0-9]{8,10}))|(?:(DE)\s*([0-9]{9}))|(?:(CY)\s*([0-9]{8}[A-Z]))|(?:(DK)\s*([0-9]{8}))|(?:(EE)\s*([0-9]{9}))|(?:(GR)\s*([0-9]{9}))|(?:(ES)\s*([0-9A-Z][0-9]{7}[0-9A-Z]))|(?:(FI)\s*([0-9]{8}))|(?:(FR)\s*([0-9A-Z]{2}[0-9]{9}))|(?:(GB)\s*(([0-9]{9}|[0-9]{12})~(GD|HA)[0-9]{3}))|(?:(HU)\s*([0-9]{8}))|(?:(IE)\s*([0-9][A-Z0-9\\+\\*][0-9]{5}[A-Z]))|(?:(IT)\s*([0-9]{11}))|(?:(LT)\s*(([0-9]{9}|[0-9]{12})))|(?:(LU)\s*([0-9]{8}))|(?:(LV)\s*([0-9]{11}))|(?:(MT)\s*([0-9]{8}))|(?:(NL)\s*([0-9]{9}B[0-9]{2}))|(?:(PL)\s*([0-9]{10}))|(?:(PT)\s*([0-9]{9}))|(?:(SE)\s*([0-9]{12}))|(?:(SI)\s*([0-9]{8}))|(?:(SK)\s*([0-9]{10}))|(?:\D|^)([0-9]{11})(?:\D|$)|(?:(CHE)(-|\s*)([0-9]{3}\.[0-9]{3}\.[0-9]{3}))/ip; 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