Regular Expressions Cheat Sheet by DaveChild

A quick reference guide for regular expressions (regex), including symbols, ranges, grouping, assertions and some sample patterns to get you started. ShowMenu YourFavouriteCheatSheetsYourMessagesYourBadgesYourFriendsYourCommentsViewProfileEditProfileChangePasswordLogoutNewCheatSheetNewLinkNewUploadLiveCheatSheetsDraftCheatSheetsCollaborationsLinksLogin or Register HomeLoginRegisterCheatSheetsProgrammingCheatSheetsSoftwareCheatSheetsBusinessandMarketingCheatSheetsEducationCheatSheetsHomeandHealthCheatSheetsGamesandHobbiesCheatSheetsNewCheatSheetsPopularCheatSheetsCheatSheetsbyTagCheatSheetsbyLanguageCheatSheetLinksCreateGettingStartedCreateaNewCheatSheetUploadaCheatSheetLinktoaCheatSheetACheatSheetforMakingCheatSheets!CommunityCommunityBadgesFriendsJoinUs!LoginTwitterFacebookPinterestInstagramHelp Cheatography https://cheatography.com DownloadThisCheatSheet(PDF)74CommentsRating: () Home > Programming > RegularExpressionsCheatSheets RegularExpressionsCheatSheetbyDaveChildAquickreferenceguideforregularexpressions(regex),includingsymbols,ranges,grouping,assertionsandsomesamplepatternstogetyoustarted.Anchors^Startofstring,orstartoflineinmulti-linepattern\AStartofstring$Endofstring,orendoflineinmulti-linepattern\ZEndofstring\bWordboundary\BNotwordboundary\Endofword CharacterClasses\cControlcharacter\sWhitespace\SNotwhitespace\dDigit\DNotdigit\wWord\WNotword\xHexade­cimaldigit\OOctaldigit POSIX[:upper:]Uppercaseletters[:lower:]Lowercaseletters[:alpha:]Allletters[:alnum:]Digitsandletters[:digit:]Digits[:xdigit:]Hexade­cimaldigits[:punct:]Punctu­ation[:blank:]Spaceandtab[:space:]Blankcharacters[:cntrl:]Controlcharacters[:graph:]Printedcharacters[:print:]Printedcharactersandspaces[:word:]Digits,lettersandunderscore Assertions?=Lookaheadassertion?!Negativelookahead?<=Lookbehindassertion?!=or?Once-onlySubexp­ression?()Condition[ifthen]?()|Condition[ifthenelse]?#Comment  Quanti­fiers*0ormore{3}Exactly3+1ormore{3,}3ormore?0or1{3,5}3,4or5Adda?toaquantifiertomakeitungreedy. EscapeSequences\Escapefollowingcharacter\QBeginliteralsequence\EEndliteralsequence"­Esc­api­ng"isawayoftreatingcharacterswhichhaveaspecialmeaninginregularexpres­sionsliterally,ratherthanasspecialcharac­ters. CommonMetach­ara­cters^[.${*(\+)|?<>Theescapecharacterisusually\ SpecialCharacters\nNewline\rCarriagereturn\tTab\vVerticaltab\fFormfeed\xxxOctalcharacterxxx\xhhHexcharacterhh  GroupsandRanges.Anycharacterexceptnewline(\n)(a|b)aorb(...)Group(?:...)Passive(non-c­apt­uring)group[abc]Range(aorborc)[^abc]Not(aorborc)[a-q]Lowercaseletterfromatoq[A-Q]UppercaseletterfromAtoQ[0-7]Digitfrom0to7\xGroup/­sub­patternnumber"­x"Rangesareinclusive. PatternModifiersgGlobalmatchi *Case-i­nse­nsitivem *Multipleliness *Treatstringassinglelinex *Allowcommentsandwhitespaceinpatterne *Evaluatereplac­ementU *Ungreedypattern*PCREmodifier StringReplac­ement$nnthnon-pa­ssivegroup$2"­xyz­"in/^(abc­(xy­z))$/$1"­xyz­"in/^(?:a­bc)­(xyz)$/$`Beforematchedstring$'Aftermatchedstring$+Lastmatchedstring$&EntirematchedstringSomeregeximplem­ent­ationsuse\insteadof$. development  regex  regular  expressions  programming DownloadtheRegularExpressionsCheatSheet 1Page https://cheatography.com/davechild/cheat-sheets/regular-expressions/ //media.cheatography.com/storage/thumb/davechild_regular-expressions.750.jpgPDF(recommended)PDF(1page)Alternative DownloadsPDF(blackandwhite)LaTeXYourDownloadWillBeginAutomaticallyin5Seconds.Close CreatedBy DaveChild https://aloneonahill.comMetadataLanguages: EnglishPublished:19thOctober,2011LastUpdated:12thMarch,2020 Rated: 5starsbasedon 359ratingsFavouritedBy and534more... Comments Doug, 10:0228Nov11Yourregexcheatsheetsays^is"Startofstring"and$is"Endofstring"DaveChild,10:0228Nov11HiDoug.I'veclarifiedthatsection.Thanksfortheheadsup:)DaveChild,10:0228Nov11NoworriesKeith-easymistaketomake!,10:0228Nov11Itlooksunchangedtome.^stillsaysit's"startofstring"and$stillsays"endofstring".Theyshouldbereversed,right?,10:0228Nov11Actually,I'msorry,you'reright!Iwasprettyconfusedthere,sorryifI'veconfusedanyoneelse. TomHunter 10:0228Nov11Canyoutagthisas'regex'?Searchingforregexoncheatographyyieldstwootherresults,butnotthisone. Doug, 22:5212Apr12Wouldyouadd\Q...\Etothecheatsheet? Jorge 12:164May12Itwouldbenicetoseethelistofwhitespacecharacters Jeff 15:449May12Greatresource!Thanksforputtingthistogetherandsharing. david 08:5820May12Whatlanguage/flavoristhis?OrIshouldalsoask,ifnonisspecified,whattendstobethedefault?I'mspecificallylookingforphporjavascript,andIknowthey'reallmostlythesame,butnot100%. Thanks! Chris 09:197Jun12David,Regexisprogramminglanguageneutral,asin,itdoesn'tmatterifyouareprogrammingregexexpressionsinjavascript,c#,c++,PHP,orevencommandline*nix,makesnodifference.Onlythingyouhavetowatchoutforissomeprogramminglanguagesmayrequiredifferentvariousregexcharacterstobeescapeddifferently(sotheprogramminglanguagedoesn'ttrytointerpretit).Usuallyabackslash.Forinstance\\meansONEbackslashinmanylanguages.BillSmith,20:2730Jan18Chris,Iamabitconfused. AtthefollowingURL(https://www.regular-expressions.info/cookbook.html),Ijustreadthis: "Thebookcoverstheregularexpressionflavors.NET,Java,JavaScript,XRegExp,Perl,PCRE,Python,andRuby,andtheprogramminglanguagesC#,Java,JavaScript,Perl,PHP,Python,Ruby,andVB.NET.Afteraquickintroduction,thebookstartswithadetailedregularexpressionstutorialwhichequallycoversall8regexflavors." Iamhavingtroublesquaringthequotedstatementwithwhatyouwroteabove. Thanks. AndyGrosland 09:4528Jun12Veryhandy,thankyou! Don'tforgetPerl;-) littleguy 15:236Aug12Greatandusefulstuff! Chilean 14:0323Aug12Hi,I'mtryingtolearnREGEX,andIneedtofindthis:"Page1Of60",....."Page50of60",ButIcan'tfinditusingreg.expressions!:(.Howwouldyoudothat?Thankyou! krisw 08:5013Sep12Isthereacheatsheettothecheatsheet?Isthisinplainenglishanywhere?..."negativelookahead"..huh? Travis 13:074Oct12@david,thischeatsheetisprettyneutral.ThemostcommonflavorisPerlCompatibleRegularExpressions(PCRE).Javascript'sengineisclosetothatandPHPalsohasPerlCompatiblefunctionsforRegex;theyusethePREGprefix.MosteverythingonthissheetshouldbesupportedbyPHP'sengine(IthinkPOSIXcharacterclassesarenot).Javascript'sengineisn'tasfeatureful.Someadvancedfeaturesaren'tsupported,butallthebasicsarethere.Ifyouneedamultilinematchandyoucan'tusetheflag,youcanuseaninvertedclassrangesuchas[\s\S]inplaceofthe.(dot)tomatchanythingincludingnewlines. @Chilean+krisw,YouneedtofindaresourceforlearningRegularExpressions.Thischeatsheetisforreference,notlearning.Checkouthttp://www.regular-expressions.info/ fsnow55 16:1722Oct12Iwasconfusedbythefirstcomment(whichwaswrong,butyoucompoundedtheerrorwithanacknowlegement).^isthestartofstringorline.Period. Also,yourcheatsheetisbetterorganizedthanthemorecomprehensivehttp://www.regular-expressions.info/ sinceitsmoresuccinct.Thelatterhasa1-pagesummarybutitstooverbose. ty 12:5022Nov12Nicesheet. Rob 11:4724Jan13Isthereareasonwhythe']'characterisnotlistedundermetacharacters?Doesn'tthatcharacterrequiretobeescapedifsearchedfor? Bill 11:4824Jan13HeyDave.Thanksforthecheatsheet.Youmaywanttochange"Notaorborc"whenyoudescribethe[^abc}negatedcharacterclass,becauseinEnglish,thenegationisambiguous.Itcouldmean"neitheranorbenorc."Orthe"a"couldbetheonlynegateddisjunct.Youcouldmean(~av(bvc)). Edir 09:1715Feb13Couldbeaddedtothelist. CaseConversion \l Makenextcharacterlowercase \u Makenextcharacteruppercase \L Makeentirestring(upto\E)lowercase \U Makeentirestring(upto\E)uppercase \u\L Capitalizefirstchar,lowercaserest(sentence) Gabe 17:1626Mar13Ihaveadatabaseusingregex.Iamtryingtouse^filetogetallfileswithnamefile_,file,file_name_date.butitisnotworkinganyhelp david.baird, 18:5915Jul13Is\xsupportedanywhere?Ican'tfindexamplesofitinusesearchingtheweb.ItalsodoesnotworkinascriptonmyMacintosh,OSX10.7.5usingtheOS'sperlinstallation. DrewWhite 15:1013Feb14I'mtryingtocomeupwitharegexstringtofilterresultstoadirectorythatincludesa-zA-Zbutthatalsoincludesanunderscore('_').Doyouknowofawaytodothis? David 15:1413Feb14Is\xsupportedanywhere?Ican'tseemtofindwhereitissupported.E.g.,perlonMacOS10.7.5.Searchingforon-lineexamplesorhelpalsofails,inthatnooneknowsaboutit. David 15:1413Feb14Is\x(RegularExpressionsCharacterClasses)supportedanywhere?Isthisanewclassthathasjustbeenadded,becauseIamunabletouseitinworkingwithIPV6addresses.Searchingforastringcontainingsomethinglike2001::1a79withaRegEx2001::\x{1,4}willfail,butifIuse2001::[a-fA-F0-9]{1,4}willwork. David 15:1413Feb14\xisatermin"RegularExpressionsCharacterClasses"foranhexadecimaldigit.Howdoesthiscomparetothe\xhh"SpecialCharacters"?Isitsupportedtoday? Benoit 08:5414Feb14Itwouldbegreattoincreaseinsomewaysthe-->:Unixlines=>Java (?i)=>Caseinsensitive=>PCRE,Perl,Java (?J)=>Allowduplicatenames=>PCRE* (?m)=>Multiline=>PCRE,Perl,Java (?s)=>Singleline(dotall)=>PCRE,Perl,Java (?u)=>Unicodecase=>Java (?U)=>Defaultmatchlazy=>PCRE (?x)=>Ignorewhitespace,comments=>PCRE,Perl,Java (?-…)=>Unsetorturnoffoptions=>PCRE aliaksandr, 04:4927Jan21Syntax=>Description (?…)=>Anamedgroup (?name…)=>Anothernamedgroup (?P…)=>AnamedgroupinPython \k=>ReferencebynameinPerl \k'name'=>ReferencebynameinPerl \g{name}=>ReferencebynameinPerl \k{name}=>Referencebynamein.NET (?P=name)=>ReferencebynameinPython aliaksandr, 22:4929Jan21Lazyquantifiers Syntax=>Description ??=>Lazyzeroorone(optional) +?=>Lazyoneormore *?=>Lazyzeroormore {n}?=>Lazyn {n,}?=>Lazynormore {m,n}?=>Lazym,nAddaComment YourCommentPleaseenteryourname.YourNamePleaseenteryouremailaddressYourEmailAddressPleaseenteryourComment.YourCommentPostYourCommentRelatedCheatSheetsPerlReferenceCardCheatSheetThisisversion2oftheperlreferencecard.mishin2Jun126Pagesdevelopment,regex,programming,perl .NETRegularExpressionsCheatSheetbyRegExLib.comAresourceforregularexpressionsin.NET.Cheatography3Jun14development,regex,regular,expressions,programmingand2more ...pythonregularexpression(regex)CheatSheetpythonregularexpressionsmutanclan19Apr193Pagesdevelopment,python,regex,regular,programming,expressionMoreCheatSheetsbyDaveChildLinuxCommandLineCheatSheetAcheatsheetofthecommandsIusemostforLinux,withpopuplinkstomanpages.DaveChild28Oct112Pagesbash,nano,linux,ls,commandlineand4more ...CSS2CheatSheetAquickreferenceguideforCSS,listingselectorsyntax,properties,unitsandotherusefulbitsofinformation.DaveChild19Oct112Pagescss,webdesign,web,design,frontendmod_rewriteCheatSheetAmod_rewriteCheatSheet-aquickreferenceguideformod_rewrite,withrewriteflags,regularexpressionsyntaxandsamplerules.DaveChild19Oct112Pagesdevelopment,rewrite,mod-rewrite,apache,lampand4more ...LatestCheatSheet2Pages (0)Rest-Assured:ExtractvaluebyGPathCheatSheetThisisforRest-Assuredcourseinhttps://giangtester.com/Giang.nd25087Jul22RandomCheatSheet2Pages (2)GIII:StomachCheatSheetGastroenterologyksellybelly6Aug14,updated12May16medical,disease,gastroenterology,stomach,neoplasm,pudAboutCheatographyCheatographyisacollectionof5167cheatsheetsandquickreferencesin25languagesforeverythingfromtraveltohistory!BehindtheScenesIfyouhaveanyproblems,orjustwanttosayhi,youcanfindusrighthere:DaveChildSpaceDuckCheatographyRecentActivityGiang.nd2508publishedRest-Assured:ExtractvaluebyGPath.2hours9minsagorehman225publishedPhysics-Elementsofvectors.11hours17minsagoomarffkamelpublishedPandas.17hours5minsagoBrandonGenepublishedPop!_OS.17hours16minsagocaptain_deerpublishedGermanA1.19hours25minsago ©2011-2022Cheatography.com | CCLicense | Terms | Privacy LatestCheatSheetsRSSFeed