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

/
/
gmi

Test String

Code Generator

Language

Generated Code

use strict; my $str = 'n 1 e 0 n 1.1 e 0 n49.54.15.21 e1 n49.54.15.21° e1 n49.54.15.21\' e1 n49.54.15.21" e1 n49.54\' 15.24" e1 n49.54\' 15.24.541" e1 n49.54.15.21\' 5456.4646" e1 n 1° e 0 n 1.1° e 0 n 1.1.1° e 0 n 1°1 e 0 n 1.1°1 e 0 n 1°1\' e 0 n 1.1°1\' e 0 n 1.1°1.1 e 0 n 1.1°1.1\' e 0 n 1°1.1.1 e 0 n 1.1°1.1.1 e 0 n 1°1.1.1\' e 0 n 1.1°1.1.1\' e 0 n 1.1°12.12.12 e 0 n 1.1°12.12.12\' e 0 n 1°1" e 0 n 1.1°1" e 0 n 1°1.12.21" e 0 n 11.11°12.212.21" e 0 n 11.11°11.1111\'12212.21" e 0 n 11.11°11.11.11\'12212.21" e 0 n 11.11°11.1111\'12.212.21" e 0 N 0° 00\' 000.000" E 0° 00\' 000" N0°00\'000 E0°00\' n 0° 00 , w 0° 00.000 S 0° 0" ,E 0° 0.00" s 0.00°, w0 N 49°121.47.247",W16°5496.2944466.54" N 49°12.41.47247",W16°54.96\'4.2946654"'; my $regex = qr/^(N|S)?\s*(\d*[.])?\d+(\x{00b0}\s*)?((\d*[.])?\d+((\x{0022})|((\x{0027}\s*)?)?((\d*[.])?\d+?(\x{0022})?)?))?[\s\x{002c}]+(W|E)?\s*(\d*[.])?\d+(\x{00b0}\s*)?((\d*[.])?\d+((\x{0022})|((\x{0027}\s*)?)?((\d*[.])?\d+(\x{0022})?)?))?$/mip; 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