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"^[\(\[].*?[\)\]]", flags=re.MULTILINE) test_str = ("[Part 1: A]\n" "Was hab’ ich nur getan?\n" "Hab mich selbst nie hinterfragt\n" "Wer bin ich, wer bin ich, wer bin ich, was bin ich bloß?\n" "Aaaah - wer bin ich, was bin ich bloß?\n" "Ging es all die Zeit lang wirklich nur um mich?\n" "Nur um mich, nur um mich, nur um mich?\n" "Denk’ ich wirklich immer nur an mich?\n" "Nur an mich, nur an mich, nur an mich?\n\n" "[Part 2: T]\n" "Ich bin so horrible, horrible, horrible\n" "Fehler einzusehen ist mir nicht possible, possible, possible\n" "Jaaah - doch ich denk’ jeden Tag an all den Shit, den ich getan hab’\n" "Warum unterschätz’ ich meinen Impact auf die andern?\n" "Homie, sag mir, warum ficke ich mein Karma\n" "Und geb kein’ Fick auf alles, was die Stimme in mir labert?\n" "Blockiert mich da mein Ego oder weiß ich es nicht besser?\n" "Mann, wann verdammt fühl ich mich bereit etwas zu ändern?\n" "Warum lass’ ich einfach nichts mehr an mich ran?\n" "Warum lass’ ich selbst mich selbst nicht an mich ran?\n" ",1\n\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