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 $str = 'Linda Casa Térrea com edícula em São Paulo - Vila Alpina<br /><br /> Casa principal é térrea. Sala de estar, sala de jantar cozinha ampla, 03 dormitórios sendo 01 suíte com closet, 05 vagas cobertas. <br /> Casa principal é térrea. Sala de estar, sala de jantar e cozinha ampla. <li>Teste 1</li><li>Teste 2</li><li>Teste 3</li><br /> Casa dos fundos é um loft moderno com pé direito duplo, mezanino, sala 02 ambientes com lareira, cozinha americana planejada, 01 suíte com armários planejados e hidromassagem, jardim de inverno com espelho d\'água. <br /><br /> Jardim com 80 m², espaço gourmet com 02 quiosques. <br /><br /><b> Área construída 300 m² / Área total 380 m²:</b><li>Teste 1</li><li>Teste 2</li><li>Teste 3</li><br /><br /> Valor R$ 800.000,00<br /> <span class="censor">Ref. 3128</span><br /><br /> <br /> <a class="censor link txtLnk ex" href="link=Z2FicmllbGltb3ZlaXMuY29tLmJy" title="Clique para abrir este link" rel="nofollow">teste.com.br</a><br /> <a class="censor link txtLnk nb" href="mailto:teste@teste.com.br" title="Clique para enviar um email a este destinatário" rel="nofollow">teste@teste.com.br</a>'; my $regex = qr/<li.*?(?!<br).*?\/li>/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