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

/
/
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"(?:\sF\d+.*?\n\n)(\n)" test_str = ("A N K U N F T 11.08.15\n" "*** NEUBUCHUNG ***\n" " 11.08.15 xxx xxx X3 2830 14:25 17:50\n" " 18.08.15 xxx xxx X3 2831 18:40\n" " F882129 dsdsaidsaia\n" " F882129 xxxyxyagydaysd\n\n\n\n" "A N K U N F T 18.08.15\n" "*** NEUBUCHUNG ***\n" " 11.08.15 xxx xxx X3 2830 14:25 17:50\n" " 18.08.15 xxx xxx X3 2831 18:40\n" " F881554 ZXCXZCXCXZCCXZ\n" " F881554 xcvcxvcxvcvxc\n" " F881554 xvcxvcxcvxxvccvxxcv\n\n\n\n" "11.08.15 xxx xxx X3 2830 14:25 17:50\n" " 18.08.15 xxx xxx X3 2831 18:40\n" " F881605 xczxcdfsfdsdfs\n" " F881605 zxccxzxzdffdsfds\n\n\n") 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