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"
"
gm

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"'name': '(.*?)', 'awardedAt': (-?\d+)," test_str = ("[{'name': 'Locus Award', 'awardedAt': 1230796800000, 'category': 'Best Young Adult Book', 'hasWon': None}, {'name': 'Georgia Peach Book Award', 'awardedAt': 1230796800000, 'category': '', 'hasWon': None}, {'name': 'Buxtehuder Bulle', 'awardedAt': 1230796800000, 'category': None, 'hasWon': None}, {'name': 'Golden Duck Award', 'awardedAt': 1230796800000, 'category': 'Young Adult (Hal Clement Award)', 'hasWon': None}, {'name': \"Grand Prix de l'Imaginaire\", 'awardedAt': 1262332800000, 'category': 'Roman jeunesse étranger', 'hasWon': None}, {'name': 'Books I Loved Best Yearly (BILBY) Awards', 'awardedAt': 1325404800000, 'category': 'Older Readers', 'hasWon': None}, {'name': \"West Australian Young Readers' Book Award (WAYRBA)\", 'awardedAt': 1262332800000, 'category': 'Older Readers', 'hasWon': None}, {'name': \"Red House Children's Book Award\", 'awardedAt': 1262332800000, 'category': 'Older Readers & Overall', 'hasWon': None}, {'name': 'South Carolina Book Award', 'awardedAt': 1293868800000, 'category': 'Junior and Young Adult Book', 'hasWon': None}, {'name': 'Charlotte Award', 'awardedAt': 1262332800000, 'category': None, 'hasWon': None}, {'name': 'Colorado Blue Spruce Young Adult Book Award', 'awardedAt': 1262332800000, 'category': None, 'hasWon': None}, {'name': 'Teen Buckeye Book Award', 'awardedAt': 1230796800000, 'category': None, 'hasWon': None}, {'name': \"Pennsylvania Young Readers' Choice Award\", 'awardedAt': 1262332800000, 'category': 'Young Adults', 'hasWon': None}, {'name': 'Rhode Island Teen Book Award', 'awardedAt': 1262332800000, 'category': None, 'hasWon': None}, {'name': 'Vermont Golden Dome Book Award', 'awardedAt': 1262332800000, 'category': None, 'hasWon': None}, {'name': 'Evergreen Teen Book Award', 'awardedAt': 1293868800000, 'category': None, 'hasWon': None}, {'name': 'Soaring Eagle Book Award', 'awardedAt': 1230796800000, 'category': None, 'hasWon': None}, {'name': 'Milwaukee County Teen Book Award', 'awardedAt': 1262332800000, 'category': '', 'hasWon': None}, {'name': 'Sakura Medal', 'awardedAt': 1262332800000, 'category': 'Middle School Book', 'hasWon': None}, {'name': 'Michigan Library Association Thumbs Up! Award', 'awardedAt': 1230796800000, 'category': None, 'hasWon': None}, {'name': 'Florida Teens Read', 'awardedAt': 1230796800000, 'category': None, 'hasWon': None}, {'name': 'Deutscher Jugendliteraturpreis', 'awardedAt': 1262332800000, 'category': 'Preis der Jugendjury', 'hasWon': None}, {'name': 'Iowa High School Book Award', 'awardedAt': 1293868800000, 'category': '', 'hasWon': None}, {'name': 'New Mexico Land of Enchantment Award', 'awardedAt': 1293868800000, 'category': 'Young Adult', 'hasWon': None}, {'name': 'Eliot Rosewater Indiana High School Book Award', 'awardedAt': 1262332800000, 'category': None, 'hasWon': None}, {'name': 'The Inky Awards', 'awardedAt': 1230796800000, 'category': 'Silver Inky', 'hasWon': None}, {'name': 'California Young Readers Medal', 'awardedAt': 1293868800000, 'category': 'Young Adult', 'hasWon': None}, {'name': 'Lincoln Award', 'awardedAt': 1293868800000, 'category': '', 'hasWon': None}, {'name': 'Kinderboekwinkelprijs', 'awardedAt': 1262332800000, 'category': '', 'hasWon': None}, {'name': 'Truman Readers Award', 'awardedAt': 1293868800000, 'category': None, 'hasWon': None}, {'name': 'CYBILS Award', 'awardedAt': 1199174400000, 'category': 'Young Adult Fantasy & Science Fiction', 'hasWon': None}, {'name': 'Literaturpreis der Jury der jungen Leser', 'awardedAt': 1262332800000, 'category': 'Jugendbuch', 'hasWon': None}, {'name': 'The Inky Awards Shortlist', 'awardedAt': 1230796800000, 'category': 'Silver Inky', 'hasWon': None}, {'name': 'Prix Et-lisez-moi', 'awardedAt': 1293868800000, 'category': None, 'hasWon': None}, {'name': 'Gateway Readers Award', 'awardedAt': 1293868800000, 'category': None, 'hasWon': None}, {'name': 'Oklahoma Sequoyah Award', 'awardedAt': 1293868800000, 'category': 'High School and Intermediate', 'hasWon': None}, {'name': 'Premio El Templo de las Mil Puertas', 'awardedAt': 1230796800000, 'category': 'Mejor novela extranjera perteneciente a saga', 'hasWon': None}, {'name': \"Rebecca Caudill Young Readers' Book Award\", 'awardedAt': 1293868800000, 'category': None, 'hasWon': None}, {'name': 'LovelyBooks Leserpreis', 'awardedAt': 1230796800000, 'category': 'Fantasy', 'hasWon': None}, {'name': 'LovelyBooks Leserpreis for Bestes Cover/Umschlag', 'awardedAt': 1230796800000, 'category': None, 'hasWon': None}, {'name': 'Premi Protagonista Jove', 'awardedAt': 1230796800000, 'category': 'Categoria 12-14 anys', 'hasWon': None}]\n") matches = re.finditer(regex, test_str, re.MULTILINE) 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