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
Processing...

Test String

Code Generator

Language

Generated Code

import re regex = re.compile(r"^(到|去)?#的?((旅游|游玩)?(攻略|景区|风景区|景点|地方|地点|地|周边游)|旅游|玩)$", flags=re.MULTILINE) test_str = ("\n" "#怎么玩\n" "#有哪里好玩的\n" "#有哪里好玩\n" "#什么好玩的\n" "#哪儿好玩\n" "#什么好玩的地方\n" "#有什么好玩的\n" "#有哪好玩的\n" "#都有什么好玩的\n" "#有什么好地方\n" "#啥好玩的\n" "#有什么可玩的\n" "#有什么好玩的地\n" "#有啥可玩的\n" "#有哪好玩\n" "#什么景点\n" "#有什么好玩的呀\n" "#有什么好玩\n" "#有哪些好玩的\n" "#有哪里好玩的地方\n" "#有啥好玩的没\n" "#都有哪些好玩的\n" "#有什么风景区\n" "#有什么好景点\n" "#有什么好玩的阿\n" "#有哪里好玩呀\n" "#有什么好玩的地儿\n" "#有什么地方去\n" "#有什么好玩的没\n" "#有啥好玩的不\n" "#哪儿好玩儿\n" "#有什么可玩儿的\n" "#哪儿好玩呀\n" "#有啥好玩的地方\n" "#什么好玩的呀\n" "#有什么好玩的地方\n" "#有啥子好玩的\n" "#什么好玩儿的\n" "#都有什么景点\n" "去#有什么好玩的地方\n" "我想去#有什么好玩儿的\n" "去#有什么好玩的呀\n" "去#有什么好玩\n\n\n" "去#旅游怎么样\n" "去#玩什么\n" "去#玩\n" "去#玩怎么样\n" "#去哪里好玩\n" "#有什么玩的\n" "#有好玩的么\n" "#什么地方好玩\n" "#攻略有吗\n" "#好玩的地方有哪些\n\n" "去#的攻略\n" "#风景区\n" "去#旅游\n" "#周边游\n" "#游玩攻略\n\n\n" "#有什么可玩的\n") matches = regex.finditer(test_str) for match_num, match in enumerate(matches, start=1): print(f"Match {match_num} was found at {match.start()}-{match.end()}: {match.group()}") for group_num, group in enumerate(match.groups(), start=1): print(f"Group {group_num} found at {match.start(group_num)}-{match.end(group_num)}: {group}")

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