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

r"
"
g

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"(\w+\s+\w+\s+[\d:\s]+[A-Z]{3}\s+\d{4})[\s\S]+?((?:\w+)\s+(?:[0-9.]+))\s+(?:((?:\w+)\s*(?:[0-9.]+)))?\s+(?:((?:\w+)\s*(?:[0-9.]+)))?\s*(?:((?:\w+)\s+(?:[0-9.]+)))?\s*(?:((?:\w+)\s*(?:[0-9.]+)))?" test_str = ("Mon Feb 1 09:12:41 GMT 2016\n\n" "Rotating fax log files:\n\n" "Doing login accounting:\n" " total 688.31\n" " example 401.12\n" " _mbsetupuser 287.10\n" " root 0.05\n" " admin 0.04\n\n" "-- End of monthly output --\n\n" "Tue Feb 16 14:27:21 GMT 2016\n\n" "Rotating fax log files:\n\n" "Doing login accounting:\n" " total 0.00\n\n" "-- End of monthly output --\n\n" "Thu Mar 3 09:37:31 GMT 2016\n\n" "Rotating fax log files:\n\n" "Doing login accounting:\n" " total 377.92\n" " example 377.92\n\n" "-- End of monthly output --") matches = re.finditer(regex, test_str) 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