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

# coding=utf8 # the above tag defines encoding for this document and is for Python 2.x compatibility import re regex = r"<li.*?(?!<br).*?\/li>" test_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>" matches = re.finditer(regex, test_str, re.MULTILINE) for matchNum, match in enumerate(matches, start=1): print ("Match {matchNum} was found at {start}-{end}: {match}".format(matchNum = matchNum, start = match.start(), end = match.end(), match = match.group())) for groupNum in range(0, len(match.groups())): groupNum = groupNum + 1 print ("Group {groupNum} found at {start}-{end}: {group}".format(groupNum = groupNum, start = match.start(groupNum), end = match.end(groupNum), group = match.group(groupNum))) # Note: for Python 2.7 compatibility, use ur"" to prefix the regex and u"" to prefix the test string and substitution.

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 Python, please visit: https://docs.python.org/3/library/re.html