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"\s*<Title\svodBackOfficeId=\"([^\s]*)\">") test_str = ("<?xml version=\"1.0\" encoding=\"utf-8\"?>\n" "<Titles xmlns=\"urn:eventis:prodis:onlineapi:2.0\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\">\n" " <Title vodBackOfficeId=\"00181253-684f-4911-92ab-91859bc4402a\">\n" " <IngestId>1001_00000000071p1</IngestId>\n" " <Name>Superbabies: Baby Geniuses 2 71</Name>\n" " <Description>A group of smart-talking toddlers find themselves at the center of a media moguls experiment to crack the code to baby talk. The toddlers must race against time for the sake of babies everywhere.</Description>\n" " <ContentProvider>Arrivo</ContentProvider>\n" " <CurrentTitleType>Feature</CurrentTitleType>\n" " <IsApp>false</IsApp>\n" " <Assets>\n" " <Asset vodBackOfficeId=\"dc640b52-3067-4ba2-8506-474996126089\" encodingProfileCode=\"Cable\"/>\n" " <Asset vodBackOfficeId=\"0a36f3c4-1484-4631-be26-f01a955966ae\" encodingProfileCode=\"Orion\"/>\n" " <Asset vodBackOfficeId=\"00a0cca8-9d09-4048-bf17-e51b63bb1491\" encodingProfileCode=\"Widevine\"/>\n" " </Assets>\n" " <MetadataIngestId>1001_00000000071p1</MetadataIngestId>\n" " </Title>\n" " <Title vodBackOfficeId=\"c4289c39-b92f-49c5-9a45-bc6eaf7b8393\">\n" " <IngestId>9110_00000000175p1</IngestId>\n" " <Name>SmartRec Test VOD 1</Name>\n" " <Description>The Tramp cares for an abandoned child, but events put that relationship in jeopardy. Dennis</Description>\n" " <ContentProvider>Arrivo</ContentProvider>\n" " <CurrentTitleType>Feature</CurrentTitleType>\n" " <IsApp>false</IsApp>\n" " <Assets>\n" " <Asset vodBackOfficeId=\"39779bf2-800f-4821-8d43-b42dffe155f9\" encodingProfileCode=\"Cable\"/>\n" " <Asset vodBackOfficeId=\"9c90a157-875e-4737-936e-3d34b60a6b61\" encodingProfileCode=\"Orion\"/>\n" " <Asset vodBackOfficeId=\"13fb314b-332c-4633-9334-d294f72e370b\" encodingProfileCode=\"Widevine\"/>\n" " </Assets>\n" " <MetadataIngestId>9110_00000000175p1</MetadataIngestId>\n" " </Title>\n" " <Title vodBackOfficeId=\"4a8bc282-8bb8-4dce-b2d1-e2129c092d80\">\n" " <IngestId>seachange.com_TEST1386088695671341</IngestId>\n" " <Name>Wanted</Name>\n" " <Description>Doormat Wesley Gibson discovers that his recently murdered father -- who Wesley never knew -- belonged to a secret guild of assassins. After a leather-clad sexpot drafts Wesley into the society, he hones his innate killing skills and turns avenger.</Description>\n" " <ContentProvider>SEAC</ContentProvider>\n" " <CurrentTitleType>Feature</CurrentTitleType>\n" " <IsApp>false</IsApp>\n" " <Assets>\n" " <Asset vodBackOfficeId=\"b0c8bdd7-00e3-4ce5-889b-73e708d75f03\" encodingProfileCode=\"Cable\"/>\n" " </Assets>\n" " <MetadataIngestId>seachange.com_TEST1386088695671341</MetadataIngestId>\n" " </Title>") 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