Regular Expressions 101

Save & Share

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8
  • .NET 7.0 (C#)
  • Rust
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests

Tools

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
No Match

/
/
g

Test String

Code Generator

Language

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"(?:\\[rn""\""]|[\r\n]+)+"; string input = @"{""\""mouse-pointer\"":59057,""\r\n\""pointer\"":59058,""\r\n\""hand\"":59059,""\r\n\""question-mark\"":59060,""\r\n\""airplay\"":58880,""\r\n\""apn\"":58882,""\r\n\""vpn\"":58883,""\r\n\""apple\"":58884,""\r\n\""windows\"":58885,""\r\n\""android\"":58886,""\r\n\""wifi\"":58887,""\r\n\""battery\"":58890,""\r\n\""camera\"":58899,""\r\n\""notification\"":58891,""\r\n\""settings\"":58991,""\r\n\""send\"":58986,""\r\n\""bookmark\"":58893,""\r\n\""bug\"":58897,""\r\n\""clock\"":58909,""\r\n\""calendar\"":58898,""\r\n\""add\"":58901,""\r\n\""minus\"":58902,""\r\n\""check\"":58903,""\r\n\""cancel\"":58904,""\r\n\""list\"":58956,""\r\n\""checklist\"":58905,""\r\n\""grid\"":58936,""\r\n\""dots\"":58921,""\r\n\""menu\"":58961,""\r\n\""tiles\"":59009,""\r\n\""clear\"":58907,""\r\n\""clear-passcode\"":58908,""\r\n\""enterprise-wipe\"":58927,""\r\n\""cloud\"":58910,""\r\n\""contact\"":58912,""\r\n\""copy\"":58913,""\r\n\""paste\"":58968,""\r\n\""undo\"":59011,""\r\n\""redo\"":58973,""\r\n\""dashboard\"":58914,""\r\n\""view\"":59025,""\r\n\""focus\"":59061,""\r\n\""delete\"":58916,""\r\n\""save\"":58981,""\r\n\""register\"":58974,""\r\n\""change-passcode\"":58900,""\r\n\""edit\"":58924,""\r\n\""sign-up\"":58993,""\r\n\""deploy\"":58917,""\r\n\""dial-up\"":58919,""\r\n\""dss\"":58922,""\r\n\""ebook\"":58923,""\r\n\""import\"":58940,""\r\n\""export\"":58929,""\r\n\""factory-reset\"":58930,""\r\n\""file-browse\"":58931,""\r\n\""grouping\"":59055,""\r\n\""folder\"":59062,""\r\n\""filter\"":58932,""\r\n\""sort\"":58995,""\r\n\""sort-up\"":58955,""\r\n\""sort-down\"":58979,""\r\n\""faq\"":59063,""\r\n\""message\"":58933,""\r\n\""forum\"":58934,""\r\n\""chat\"":59064,""\r\n\""mail\"":58959,""\r\n\""invitation\"":58943,""\r\n\""usb-drive\"":59022,""\r\n\""hdd\"":58937,""\r\n\""home\"":58938,""\r\n\""hour-glass\"":58939,""\r\n\""incoming-call\"":58941,""\r\n\""key\"":58951,""\r\n\""lifecycle\"":58954,""\r\n\""list-sort\"":58957,""\r\n\""lock\"":58958,""\r\n\""map-location\"":58960,""\r\n\""laptop\"":58952,""\r\n\""mobile\"":58962,""\r\n\""ringing\"":59028,""\r\n\""computer\"":58963,""\r\n\""devices\"":58918,""\r\n\""mute\"":58965,""\r\n\""unmute\"":59054,""\r\n\""ok\"":58967,""\r\n\""error\"":58928,""\r\n\""circle\"":58906,""\r\n\""ring\"":58911,""\r\n\""pdf\"":58969,""\r\n\""ms-document\"":58964,""\r\n\""pie-chart\"":58970,""\r\n\""bar-chart\"":59056,""\r\n\""publish\"":58972,""\r\n\""resource\"":58976,""\r\n\""rules\"":58980,""\r\n\""scep\"":58982,""\r\n\""security\"":58985,""\r\n\""search\"":58984,""\r\n\""sequence\"":58987,""\r\n\""servers\"":58988,""\r\n\""ldap\"":58953,""\r\n\""database\"":58915,""\r\n\""hardware\"":59049,""\r\n\""signal\"":59065,""\r\n\""raspberry\"":59050,""\r\n\""arduino\"":59051,""\r\n\""share\"":58992,""\r\n\""star\"":58996,""\r\n\""coins\"":59066,""\r\n\""statistics\"":58997,""\r\n\""store\"":58998,""\r\n\""subscribe\"":58999,""\r\n\""fan\"":59067,""\r\n\""light\"":59068,""\r\n\""subscribed-calendar\"":59000,""\r\n\""tag\"":59002,""\r\n\""tasks\"":59003,""\r\n\""blank-document\"":58892,""\r\n\""document\"":58920,""\r\n\""text\"":59004,""\r\n\""policy\"":59005,""\r\n\""security-policy\"":59006,""\r\n\""throttling-policy\"":59007,""\r\n\""ticked-box\"":59008,""\r\n\""uncheck\"":59010,""\r\n\""upload\"":59020,""\r\n\""download\"":58975,""\r\n\""up\"":59012,""\r\n\""down\"":59013,""\r\n\""left\"":59014,""\r\n\""right\"":59015,""\r\n\""up-arrow\"":59016,""\r\n\""down-arrow\"":59017,""\r\n\""left-arrow\"":59018,""\r\n\""right-arrow\"":59019,""\r\n\""endpoint\"":58925,""\r\n\""uri\"":59021,""\r\n\""broken-link\"":58896,""\r\n\""user\"":59023,""\r\n\""add-user\"":59024,""\r\n\""refresh\"":59026,""\r\n\""warning\"":59027,""\r\n\""info\"":58942,""\r\n\""block\"":59029,""\r\n\""bpmn\"":58895,""\r\n\""schema\"":58983,""\r\n\""organization\"":59052,""\r\n\""public\"":59053,""\r\n\""bpel\"":58894,""\r\n\""application\"":58888,""\r\n\""applications\"":58889,""\r\n\""public-app\"":58971,""\r\n\""enterprise-app\"":58926,""\r\n\""web-app\"":59030,""\r\n\""globe\"":59031,""\r\n\""webclip\"":59032,""\r\n\""proxy\"":59033,""\r\n\""web-service\"":59034,""\r\n\""website\"":59035,""\r\n\""gadget\"":58935,""\r\n\""api\"":58881,""\r\n\""rest-api\"":58977,""\r\n\""rest-service\"":58978,""\r\n\""jaxrs\"":58949,""\r\n\""service\"":58989,""\r\n\""service-provider\"":58990,""\r\n\""java-spring\"":58948,""\r\n\""jquery\"":58950,""\r\n\""swagger\"":59001,""\r\n\""java\"":58945,""\r\n\""javaee\"":58946,""\r\n\""javascript\"":58947,""\r\n\""jaggery\"":58944,""\r\n\""nodejs\"":58966,""\r\n\""xml\"":59036,""\r\n\""soap\"":58994,""\r\n\""html\"":59037,""\r\n\""war\"":59038,""\r\n\""xacml\"":59039,""\r\n\""wsdl\"":59040,""\r\n\""wadl\"":59041,""\r\n\""xq\"":59042,""\r\n\""xsd\"":59043,""\r\n\""xslt\"":59044,""\r\n\""zoom-in\"":59045,""\r\n\""zoom-out\"":59046,""\r\n\""wso2-logo\"":59047,""\r\n\""wso2\"":59048}"; foreach (Match m in Regex.Matches(input, pattern)) { Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index); } } }

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 C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx