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 = '5758 6128 370 kWh 1 370 kWh 11,93 kWh 12/07/2019 01/08/2019 Mês kWh Dt.Pgto. Valor 06/2019 355 17/06/2019 343,79 NOTA FISCAL/CONTA DE ENERGIA ELÉTRICA N° 085.976.711 - SÉRIE B Emitida em 03/07/2019 05/2019 332 14/05/2019 306,84 Produto Valor Valor Base Aliq. 04/2019 415 29/05/2019 378,67 Descrição Un. Consumo Unitário Total Cálc. ICMS 03/2019 308 14/05/2019 269,81 ENERGIA ELETRICA CONSUMO kWh 370 0,787324 291,31 291,31 29,00% 02/2019 347 26/04/2019 305,09 ENERGIA CONS. B.AMARELA kWh 0,54 0,54 29,00% 01/2019 341 11/03/2019 324,39 12/2018 301 26/12/2018 287,83 5758 6128 370 kWh 1 370 kWh 11,93 kWh 12/07/2019 01/08/2019 Mês kWh Dt.Pgto. Valor 06/2019 355 17/06/2019 343,79 NOTA FISCAL/CONTA DE ENERGIA ELÉTRICA N° 085.976.711 - SÉRIE B Emitida em 03/07/2019 05/2019 332 14/05/2019 306,84 Produto Valor Valor Base Aliq. 04/2019 415 29/05/2019 378,67 Descrição Un. Consumo Unitário Total Cálc. ICMS 03/2019 308 14/05/2019 269,81 ENERGIA ELETRICA CONSUMO kWh 370 0,787324 291,31 291,31 29,00% 02/2019 347 26/04/2019 305,09 ENERGIA CONS. B.AMARELA kWh 0,54 0,54 29,00% 01/2019 341 11/03/2019 324,39 12/2018 301 26/12/2018 287,83'; my $regex = qr/ENERGIA ELETRICA CONSUMO.*?%/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