Regular Expressions 101

Save & Manage Regex

  • Current Version: 2
  • 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"(?=.*\{myVariable1\})(?=.*<html>)(?!.*<script>)", flags=re.DOTALL) test_str = ("Recycle Bin <scrippt>\n" "Assigned to me 18 work items (1 selected)\n" "ResultsEditorCharts Work item paneBottom\n" "Save query\n" "Column options {myVariable1}\n" "Filter\n" "IDWork Item TypeTitleStateRemaining WorkSeverityCreated Date705801Bug Ipad Tablet_PM Planning Labor Grid: Show Cost/Billing dropdown menu is overlapped by Plan Settings menu in PM workspace >> Planning Labor gridCommitted 38/24/2016 11:49:02 PM705969Bug Android Tablet_PM Planning Labor Grid: Columns displayed in Labor middle grid are overlappingCommitted 38/25/2016 4:56:55 AM705973Bug Android Tablet_PM Planning Labor Grid: Available Columns and Selected Columns grids are not displayed in Labor Grid SettingsCommitted 38/25/2016 5:08:06 AM712031Bug Column settings do not use the correct defaultsCommitted 39/14/2016 12:22:09 PM716142Bug Ipad Tablet_PM Plan/Project mode: List of Projects are not displayed properly in Project Result list dropdown menuCommitted 39/28/2016 2:06:17 AM707226Task Dev: Client - Remove Project Settings option and move individual settings to other placesDone 8/30/2016 4<html>35:35 PM619943Task Dev: Client - Actions popup menuDone 7/1/2016 2:03:11 PM693953Task dev:fix options above grid (PBI 612771)Done 7/26/2016 1:36:11 PM696198Task Dev: Changes to grid column selection dialog to support cost and billing views.Done 8/1/2016 1:37:43 PM699509Bug # selections above grid doesnt appear when paging is appliedIn Development 38/9/2016 12:46:11 PM699660Bug # selection doesn't show when \"select All\" checkbox is disabledIn Development ") match = regex.search(test_str) if match: print(f"Match 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