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

Substitution
Processing...

Code Generator

Language

Generated Code

import re regex = re.compile(r"\s*(\d{1,3})\.?\s*((?:(?:O-O(?:-O)?)|(?:[KQNBR][a-h]?x?[a-h]x?[1-8])|(?:[a-h]x?[a-h]?[1-8]))\+?\#?)(?:\s*\d+\.?\d+?m?s?)?\s*((?:(?:O-O(?:-O)?)|(?:[KQNBR][a-h]?x?[a-h]x?[1-8])|(?:[a-h]x?[a-h]?[1-8]))\+?\#?)(?:\s*\d+\.?\d+?m?s?)?") test_str = ("[Event \"?\"] [Site \"?\"] [Date \"2018.04.11\"] [Round \"?\"] [White \"Bond\"] [Black \"Tor\"] [Result \"1/2-1/2\"] [ECO \"C88\"] [Annotator \"Top\"] [PlyCount \"26\"] [SourceDate \"2018.04.11\"] [SourceVersionDate \"2018.04.11\"]\n" "1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. h3 Bb7 9. d3 d6 10. a3 Nb8 11. Nbd2 Nbd7 12. Nf1 Re8 13. Ng3 Bf8 1/2-1/2") subst = "$1.$2.$3\\n" result = regex.sub(subst, test_str) if result: print(result)

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