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

Code Generator

Language

Generated Code

use strict; my $str = 'LB,32736,0,T,NRJ.POMPES_BACHE.PUISSANCE_ELEC_INST,20190811T080000.000Z,20190811T194400.000Z TR,NRJ.POMPES_BACHE.PUISSANCE_ELEC_INST,0,65535,1,1,,0,0,2 20190811T080000.000Z,0.00800000037997961,192 20190811T080100.000Z,0.008999999612569809,192 20190811T080200.000Z,0.008999999612569809,192 LB,32734,0,T,NRJ.POMPES_BACHE.PUISSANCE_ELEC_CPT,20190811T080000.000Z,20190811T201200.000Z TR,NRJ.POMPES_BACHE.PUISSANCE_ELEC_CPT,0,65535,1,1,,0,0,2 20190811T080000.000Z,0.6743068099021912,192 20190811T080100.000Z,0.6744459867477417,192 20190811T080200.000Z,0.6745882630348206,192 20190811T080300.000Z,0.6747232675552368,192 20190811T080400.000Z,0.6748600006103516,192 20190811T080500.000Z,0.6749916672706604,192 20190811T080600.000Z,0.6751362681388855,192 1,2,3,4,5,6,7 1,2,3,4,5,7,7,8,9,10 1,2,3 1,2,3,4,5,6,7 1,2,3,4,5,7,7,8,9,10 1,2,3'; my $regex = qr/^(?:[^,\r\n]*,){6}.*\r?\n(?:[^,\r\n]*,){9}.*(?:\r?\n(?!(?:[^,\r\n]*,){6}.*\r?\n(?:[^,\r\n]*,){9}).*)*/mp; 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