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

import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String[] args) { final String regex = "(?:\\\\[rn\"\\\"]|[\\r\\n]+)+"; final String string = "{\"\\\"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}"; final Pattern pattern = Pattern.compile(regex); final Matcher matcher = pattern.matcher(string); while (matcher.find()) { System.out.println("Full match: " + matcher.group(0)); for (int i = 1; i <= matcher.groupCount(); i++) { System.out.println("Group " + i + ": " + matcher.group(i)); } } } }

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 Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html