Regular Expressions 101

Save & Manage Regex

  • Current Version: 1
  • Save & Share
  • Community Library

Flavor

  • PCRE2 (PHP)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java
  • .NET 7.0 (C#)
  • Rust
  • PCRE (Legacy)
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests
Sponsors
There are currently no sponsors. Become a sponsor today!
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""" ^(?=[A-Z]{1,4}\b) # Notice the matches below that don't fully match if these are NOT in reverse order: (ACCS|ALLY|ALWY|AMBL|APP|ARC|ARTL|ARTY|AV|BA|BEND|BWLK|BVD|BR|BRAE|BRK|BROW|BYPA|BYWY|CSWY|CTR|CH|CIR|CCT|CRCS|CL|CON|CPS|CNR|CT|CTYD|COVE|CR|CRST|CRSS|CSAC|CUTT|DALE|DIP|DR|DVWY|EDGE|ELB|END|ENT|ESP|EXP|FAWY|FOLW|FTWY|FORM|FWY|FRTG|GAP|GDNS|GTE|GLDE|GLEN|GRA|GRN|GR|HTS|HIRD|HWY|HILL|INTG|JNC|KEY|LANE|LNWY|LINE|LINK|LKT|LOOP|MALL|MNDR|MEWS|MTWY|NOOK|OTLK|PDE|PWY|PASS|PSGE|PATH|PWAY|PIAZ|PLZA|PKT|PNT|PORT|PROM|QDRT|QYS|RMBL|REST|RTT|RDGE|RISE|RD|RTY|RTE|ROW|RUE|SVWY|SHUN|SPUR|SQ|ST|SBWY|TARN|TCE|THFR|TLWY|TOP|TOR|TRK|TRL|TURN|UPAS|VALE|VIAD|VIEW|VSTA|WALK|WKWY|WHRF|WYND) """, flags=re.MULTILINE | re.VERBOSE) test_str = ("Value\n" "Val\n" "ABCDE\n\n" "ACCS\n" "ALLY\n" "ALWY\n" "AMBL\n" "APP\n" "ARC\n" "ARTL\n" "ARTY\n" "AV\n" "BA\n" "BEND\n" "BWLK\n" "BVD\n" "BR\n" "BRAE\n" "BRK\n" "BROW\n" "BYPA\n" "BYWY\n" "CSWY\n" "CTR\n" "CH\n" "CIR\n" "CCT\n" "CRCS\n" "CL\n" "CON\n" "CPS\n" "CNR\n" "CT\n" "CTYD\n" "COVE\n" "CR\n" "CRST\n" "CRSS\n" "CSAC\n" "CUTT\n" "DALE\n" "DIP\n" "DR\n" "DVWY\n" "EDGE\n" "ELB\n" "END\n" "ENT\n" "ESP\n" "EXP\n" "FAWY\n" "FOLW\n" "FTWY\n" "FORM\n" "FWY\n" "FRTG\n" "GAP\n" "GDNS\n" "GTE\n" "GLDE\n" "GLEN\n" "GRA\n" "GRN\n" "GR\n" "HTS\n" "HIRD\n" "HWY\n" "HILL\n" "INTG\n" "JNC\n" "KEY\n" "LANE\n" "LNWY\n" "LINE\n" "LINK\n" "LKT\n" "LOOP\n" "MALL\n" "MNDR\n" "MEWS\n" "MTWY\n" "NOOK\n" "OTLK\n" "PDE\n" "PWY\n" "PASS\n" "PSGE\n" "PATH\n" "PWAY\n" "PIAZ\n" "PLZA\n" "PKT\n" "PNT\n" "PORT\n" "PROM\n" "QDRT\n" "QYS\n" "RMBL\n" "REST\n" "RTT\n" "RDGE\n" "RISE\n" "RD\n" "RTY\n" "RTE\n" "ROW\n" "RUE\n" "SVWY\n" "SHUN\n" "SPUR\n" "SQ\n" "ST\n" "SBWY\n" "TARN\n" "TCE\n" "THFR\n" "TLWY\n" "TOP\n" "TOR\n" "TRK\n" "TRL\n" "TURN\n" "UPAS\n" "VALE\n" "VIAD\n" "VIEW\n" "VSTA\n" "WALK\n" "WKWY\n" "WHRF\n" "WYND\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