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"^([\d\- :]+)\[([a-z-0-9]+)\] *\w+ *\[\w+\]\[([a-z0-9]+)\] - \w+:([\d\- :.]+)-\w+:([\d\- :.]+)-(.*)", flags=re.MULTILINE) test_str = "2018-12-03 00:00:00:652 [http-nio-8080-exec-4] INFO [siftLog][fedb9917cd6e4833a69182044395a53c] - logTime:2018-12-02 23:59:59.326-receiveTime:2018-12-03 00:00:00.000-{\"biz\":{\"openCard\":\"0\",\"boxSn\":\"019952634704\"},\"performance\":{\"staticComplieTime\": 0,\"nodejsRequestTime\":81,\"computeDOMCustTime\":277,\"computeHTMLDownload\":53,\"wechatRedirectTime\":861,\"computeTCP\":0,\"renderTime\":466,\"wechatRedirect\":1,\"AuthRedirectTime\":861,\"allRenderTime\":1408,\"computeDOMComplie\":270,\"browserInitTime\":42,\"computeD NS\":0,\"staticDownloadTime\":7,\"whitePageTime\":1401,\"computeHTMLResponseTime\":210},\"id\":\"1543766399062-3342727d-aa75-4a06-9cc9-5851b5c0e811\",\"event\":\"performance\",\"sys\":{\"userAgent\":\"Mozilla/5.0 (Linux; Android 8.0.0; SM-A530F Build/R16NW; wv) AppleWe bKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/70.0.3538.80 Mobile Safari/537.36 MicroMessenger/6.7.3.1341(0x26070340) NetType/4G Language/ru Process/tools\"}}" 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