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"page=\"[0-9]+\".+?subject=\"(?:Text Box|Sticky Note)\".+?<\/span", flags=re.DOTALL) test_str = (" ><text color=\"#FFFF00\" creationdate=\"D:20180307100631+04'00'\" flags=\"print,nozoom,norotate\" date=\"D:20180307100652+04'00'\" name=\"a60915a3-1c23-4f6d-b8d4-fbe0dd4890e9\" icon=\"Comment\" page=\"7\" rect=\"351.308000,135.732000,371.308000,153.732000\" subject=\"Sticky Note\" title=\"saddia\"\n" "><contents-richtext\n" "><body xmlns=\"http://www.w3.org/1999/xhtml\" xmlns:xfa=\"http://www.xfa.org/schema/xfa-data/1.0/\" xfa:APIVersion=\"Acrobat:9.0.0\" xfa:spec=\"2.0.2\"\n" "><p dir=\"ltr\"\n" "><span dir=\"ltr\" style=\"font-size:10.0pt;text-align:left;color:#000000;font-weight:normal;font-style:normal\"\n" ">As agreed with WPO that any unspecific area use GEN</span\n" "><span dir=\"ltr\" style=\"font-size:11.0pt;text-align:left;color:#1D477B;font-weight:normal;font-style:normal\"\n" ">&#xD;</span\n" "><span dir=\"ltr\" style=\"font-size:11.0pt;text-align:left;color:#000000;font-weight:normal;font-style:normal\"\n" ">&#xD;</span") 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