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
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"(?<scheme>\w+):\/\/((?<user>\w+)(\:(?<password>[^\/:]+))?@)?(?<hostname>[\w-.]+)(:(?<port>\d+))?\/(?<request>(?<path>[^#\s\?]+)(\?(?<query>[^#\s]+))?(#(?<fragment>[^#\s]+))?)?") test_str = ("https://example.org/absolute/URI/with/absolute/path/to/resource.txt\n" "https://example.org/absolute/URI/with/absolute/path/to/resource.txt?a=alpha&b=bravo#bookmark\n" "https://username:password@example.org:443/absolute/URI/with/absolute/path/to/resource.txt?a=alpha&b=bravo#bookmark\n" "ftp://example.org/resource.txt\n" "ftp://johndoe@example.org/resource.txt\n" "ftp://janedoe:pa$$word@example.org/resource.txt\n" "urn:ISSN:1535–3613\n" "https://example.org/absolute/URI/with/absolute/path/to/resource.txt\n" "https://username@example.org:443/absolute/URI/with/absolute/path/to/resource.txt?a=alpha&b=bravo#bookmark\n" "https://username:password@example.org/absolute/URI/with/absolute/path/to/resource.txt?a=alpha&b=bravo#bookmark\n" "https://username:pa$$w0rd@example.org:443/absolute/URI/with/absolute/path/to/resource.txt?a=alpha&b=bravo\n" "//example.org/scheme-relative/URI/with/absolute/path/to/resource.txt\n" "https://username:pa$$w0rd@example.org:443/absolute/URI/with/absolute/path/to/resource.txt#chap01\n" "relative/path/to/resource.txt\n" "../../../resource.txt\n" "./resource.txt#frag01\n" "resource.txt\n" "#frag01\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