10 RegEx Tester for JavaScript, Python, PHP, Golang, Ruby, etc.

This free regular expression tester lets you test your regular expressions against any entry of your choice and clearly highlights all matches. Using this, we ... 10RegExTesterforJavaScript,Python,PHP,Golang,Ruby,etc. By AsadAli in Development onApril22,2022 Geekflareissupportedbyouraudience.Wemayearnaffiliatecommissionsfrombuyinglinksonthissite. RegExTesters Regex101 FreeFormatter RegexCrossword RegExr Pythex Rubular Debuggex ExtendsClass RegExTester WebToolKit InvictiWebApplicationSecurityScanner-theonlysolutionthatdeliversautomaticverificationofvulnerabilitieswithProof-BasedScanning™. Regexexpressioncanbeapain.Well,sometimes! Let’slearnaboutRegularExpressionsandtheirpatterns.Wearegoingtolookintosuchpatternsthatseemlikeaconvolutedsoupofcharacters.Wewillseewhateverycharacterinaregularexpressionmeans. Afterreadingthisarticle,youwillbeabletocreateyourregularexpressionsandusethemforasyoulike.Intheend,wewillalsolistdownsomeoftheonlineRegExtestingtoolssothatbasedonrequirementyoucancreateyourRegExandtestitusingthesetools. Introduction RegularExpressionsorasit’scommonlyknown–RegExisanysequenceofcharactersthatcanbeusedasapatterntosearchforcharactersorstrings. Forexample–todetermineifastringorphrasecontainstheword“apple”wecanusetheregex“/apple”tosearchwithinthestring.Asanotherexample,wecanuse“/[0-9]”tocheckifagivenstringcontainsanumberbetween0and9. RegularExpressionsandtheiruse Regularexpressionsarewidelyusedforavarietyofpurposesinmodern-dayweb-relatedoperations.Validationofwebforms,Websearchengines,lexicalanalyzersinIDE’s,texteditors,anddocumenteditorsareamongafewexampleswhereregularexpressionsarefrequentlyused. Wehaveallused“CTRL+F”manytimestosearchwithinadocumentorapieceofcodetofindaparticularwordoraphraseoranexpression.Thisoperationcanbepointedoutasaverycommonexampleoftheuseofregularexpressions. Beforegoingonanyfurther,let’shavealookataverycommonlyusedregularexpression. Canyouguess🤔thebelowRegEXwhatisitusedfor? ^([a-zA-Z0-9_\-\.]+)@([a-zA-Z0-9_\-\.]+)\.([a-zA-Z]{2,5})$ Don’tworryifyoucan’tguessit.Iamdamsureyouwouldbeabletoguessbytheendofthisarticle. Firstlet’sgetstartedwithA,B,CofRegEx. Tokens Tostartwith,let’slookatthevarioussymbolsintheRegexshownabove. ^([a-zA-Z0-9_\-\.]+)@([a-zA-Z0-9_\-\.]+)\.([a-zA-Z]{2,5})$ Ifwelookattheregexgivenabove,wecanseethatiscomposedofmanysymbolsorcharactersortokens.Let’sfindoutwhattheymean: Token Meaning ^ Thistokendenotesthestartofastring. (…) Thisdenotesagroupwhereeverythingthatisgivenwithin(…)iscaptured. […] The[]enclosescharactersanyofwhichcanbematched.Forexample–[abc]willmatcheitheraorborc. a-z Thesetoflowercasealphabetsfromatoz.WemustkeepinmindthatRegexiscasesensitive. A-Z ThesetofuppercasecharactersfromAtoZ. 0-9 Thedigitsfrom0to9. _ Thiswillmatchthecharacter_. \ Thisistheescapecharacter. \. Thismatchesthecharacter“.”literally.Thisisusedbecausethesymbol“.”inregexisatokeninitselfwhichmatchesanycharacter + Thisisaquantifier.Thismatchesoneormorecharactersitisusedwith.Forexample,a+meansoneormoreoccurrencesofthecharactera. \- Thiswillmatchthe“-”character. @ Thiswillmatchthe“@”character. {} Thisisanotherquantifier.Itisusedtodenotethenumberofoccurrencesofacharacter.Forexample,a{3}meansexactly3a’s. $ Thisdenotestheendofastring. BreakdownofthegivenRegexpattern Now,armedwiththispreliminaryknowledgeoftokens,let’strytodecodetheaboveregularexpression: ^([a-zA-Z0-9_\-\.]+)meanswearelookingforastringthatstartswithatleastoneormoreuppercaseorlowercasealphanumericcharacters,underscores,hyphens,ordots.Forinstance,anythingthatlookssimilartouser_name.01willmatchthepattern.Wemustrememberthatheredon’tneedtoincludeallthesymbolsjustanyonecharacterin[a-zA-Z0-9_\-\.]willdo.The@charactermatchesforasingleoccurrenceof@.Addingtothepreviousexample,somethinglike[email protected]willfit.([a-zA-Z0-9_\-\.]+) issimilartothefirstpoint.Ittoomeansthatwearelookingforastringthatcontainsatleastoneormorealphanumericcharacters,underscores,hyphens,ordots.Addingtotheexample,[email protected]willfithere.Asyoumighthavealreadyguessed,wearehintingatanemailpattern.Movingon,\.matchesthesingle“.”character.Ifwecontinuewiththeongoingexample,somethinglike[email protected]([a-zA-Z]{2,5})$thismeansthatthestringshouldendwith2to5alphabetcharacterseitheruppercaseorlowercase.Ifweadd.comtothepreviousexample,wecanget[email protected],whichisthecommonpatternofanemailstring. Combiningalloftheabove,wecanseethatwearesearchingforanemailidstring.Nowwecanusethisexpressiontovalidateanyemailid.Ifourtestemailidmatchesthispatternwecansayitisavalidemailid. P.S.–Thisapatternformostcommonemailidsontheweb. TypesofTokens ManytokenscanbeusedinvariouscombinationswithinaRegextodescribeawidevarietyofexpressions.Belowwearegoingtotakealookatthevarioustypesoftokensthatareusedinregularexpressions.Furthermore,wearealsogoingtolookatthemostcommonlyusedtokensineachcategory. BasicTokens Let’sstartwiththebasictokens.Thesetokensareusedwithalmosteveryregularexpression.Hence,wemustlearnaboutthemfirst. Token Meaning \r Thismatchesthecarriagereturncharacter. \0 Itmatchesthenullcharacter. \n Thislooksforanewline. \t Thismatchesforatab. Characterclasses Movingon,let’slookatthecharactertokens.Theyareusedtomatchalphabets,numbersandotherspecialcharacters. Token Meaning a Thismatchesliterallyforthecharactera.Similarly,allalphabetsandnumberswhenusedinisolationlookforthespecificcharacteritself. abc Itmatchesthestringabc. [abc] Thislooksforasinglecharacteramonga,borc. [^abc] Thismatchesanycharacterexceptaorborc. [a-z] Alowercasecharacterintherangefromatoz [^a-z] Anycharacternotintherangefromatoz.Thisincludesuppercasecharactersaswell. [A-Z] AnuppercasecharacterbetweenAandZ. [^A-Z] AcharacternotbetweenAandZ. [0-9] Anynumberintherange0to9 [^0-9] Acharacternotintherange0to9 [a-zA-Z0-9] ThismatchesforacharacterwhichmaybealowercasecharacterfrombetweenaandzoranycharacterbetweenAandZoranynumberbetween0and9 [^a-zA-Z0-9] Anycharacterthatdoesn’tfallinthepreviouscategory. . Anysinglecharacter \s Thisisusedtolookforanywhitespacecharacter. \S Thisisusedtolookforanynon-whitespacecharacter. \d Thismatchesforanydigit \D Thismatchesforanynon-digit \w Itmatchesanywordcharacter \W Itmatchesanynon-wordcharacter $ Thisdenotestheendofastring \b Thismatchesawordboundary \B Thisisusedtomatchanon-wordboundary Quantifiers Thisspecialclassoftokensisusedtomatchthenumberofconsecutiveoccurrencesofacharacterorastringoranumber.Theyareusedinconjunctionwiththeothertokens. Let’slookatafewcommonquantifiers. Tokens Meaning a? Thismatchesforzerooroneoccurrenceofa. a* Thismatchesforzeroormoreoccurrences(consecutive)ofa. a+ Thisisforatleastoneormoreconsecutiveoccurrencesofa. a{5} Thislooksforexactlyfiveconsecutiveoccurrencesofthelettera. a{5,} Thisisforatleastfiveormoreconsecutiveoccurrencesofa. a{5,7} Thislooksforanynumberofconsecutivea’sbetween5and7. Groups Thesetokenswillmatchingroupsasthenamesuggests. Tokens Meaning (…) Thiscaptureseverythingenclosedwithintheparenthesis. (a|b) Thismatcheseitheraorb. (?:…) Matcheseverythingenclosedwithinthebrackets (?(1)yes|no) Thismatchesaconditionalstatement. Flags Thesearespecialinstructionsgiventothepatternmatcherenginewhilesearchingforamatch. TokensMeaning g Globalmatch.Thiswillsearchuntilthematchingenginefindsnomorematch,i.e.,untiltheendofthegivenstringorgroupofstrings. m Multilinematchi.e.,linebyline. x Tellstheenginetoignorewhitespaceswhilematching. X Thisisusedforextendedmatching.  s Thismatchesasingleline.  i Thisisusedforcaseinsensitivematching.  u ForUnicodecharacters. Anchors Additionalinstructionsfortheengineregardingpositions. Tokens Meaning ^ Thisdenotesthestartofastring \A Thistoodenotesthestartofastringaswell \Z Thetokenfortheendofastring. \z Thetokenforabsoluteendofastring.  \G Thisisforthestartofamatch. Commonlyusedregularexpressions RegularexpressionsarewidelyusedovertheInternet.Fromformvalidationstolookingupdatacontainingaparticularkeywordorkeywords,regularexpressionsarealmostinseparablefrommodern-daycomputingapplications. Let’slookatsomefamiliarexamplesoftheuseofregularexpressions. Matchingaphonenumber Let’sseewhatisthepatternofaphonenumberusedinIndia.TheCountryCodecomesfirst.Itusuallycontainsa“+”characterfollowedbythenumber91,whichisthecountrycodeforIndia.Also,Indianphonenumbersgenerallystartwith6,7,8,or9.Thisisthenfollowedby9otherdigits. SoavalidregexforanIndiancellphonenumberwouldbeasgiven. ^(\+91[\-\s]?)?[0]?(91)?[6-9]\d{9}$ Testingthestrengthofpasswords Mostwebsitesrecommendustoprovideastrongpasswordwhichcontainsacombinationofnumbers,uppercaseandlowercasecharacters,andsymbols.Also,therehastobeaminimumnumberofcharacters–6or8.Thisisdonesothatthepasswordbecomesveryhardtocrack. Anypasswordfollowingthisrulecanbegeneratedorvalidatedforpasswordstrengthusingaregularexpression. ^(((?=.*[a-z])(?=.*[A-Z]))|((?=.*[a-z])(?=.*[0-9]))|((?=.*[A-Z])(?=.*[0-9])))(?=.{6,}) URLMatching URLsarethemostcommonwaytousetheinternetandquicklyvisitthewebpagewewant.AlmosteverywebsitehasanURL.Hence,everyURLisstandardizedandfollowsadefinitepattern.EveryURLeitherfollowstheHTTPortheHTTPsprotocolfollowedby“://”andthe“www”often.Thenthenameofthewebsitefollowedbya.comor.netor.orgetc. TotestthevalidityofanURLwecanusearegexliketheonegivenbelow. https?:\/\/(www\.)?[[email protected]:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*) DateandTimeformats Dateandtimeformatsarealsoverycommonlyusedacrosstheweb.Therearemanyformatsofdatesusedbyavarietyofapplicationsorsoftwareorsystems.Datesshouldalwaysbeusedinaformatthatmakesitusablefortheuserortheapplicationthatistryingtoreadit. Adateintheformatdd-MM-yyyycanbevalidatedbyusingaregularexpressionwhichcanbeasgivenbelow. ^(1[0-2]|0[1-9])/(3[01]|[12][0-9]|0[1-9])/[0-9]{4}$ Now,let’sexploresomeoftheonlineRegExtoolswhichcanbehandytobuildandtroubleshoot. Ifyouwanttolearnmoreaboutregularexpressions,theirexamples,andadvancedusages,hereisalistof websitesthatyoucanalwaysreferto: Regex101 Regex101isanexcellentreferenceguideandaninteractivetoolforcreatingyourregularexpressions,itcanhelpyougetstartedwithregexveryquickly. UsingthiswecantestRegExforthebelowlanguages. PCRE(PHP)ECMAScript(JavaScript)PythonGoLang ItprovidessupportsforRegExfunctionalitieslikeamatch,substitution,andunittests.ApartfromthisonecansavetheoldtestedRegEx. FreeFormatter FreeFormatterisJavaScript-basedandusestheXRegExplibraryforenhancedfeatures.ItfacilitatestestingaRegExagainstamatchaswellasreplacingamatch.Itsupportsbelowflags,whichcanbeuseddependingupontherequirementwhiletestingaRegEx i–Case-insensitivem–Multilineg–Global(don’tstopatthefirstmatch)s–DotmatchesallINCLUDINGlinebreaks(XRegExponly). RegexCrossword IfRegexandpuzzlesinterestyou,thisisthesitetogoto.Ithasaseriesoffunandinteractivepuzzles.Theywilldefinitelyhelpyoulearnmoreaboutregularexpressions. OptimizedforphonesandsolvingRegExpuzzlesonthego.Astepbysteptutorial,teachingyouthedifferentsymbolsandRegExpatterns.Bendyourmindaroundcubistic2DpalindromeRegExpuzzles.WiderangeofRegExpuzzleswithdifficultiesfrombeginnertoexpert. RegExr RegExrisawebsiteforgettingyourhandsdirtywithRegex.Youcanwriteregex,matchpatterns,andhaveallthefunwiththisCodepenequivalentforRegularExpressions. Features SupportsJavaScript&PHP/PCRERegEx.Resultsupdateinreal-timeasyoutype.Rolloveramatchorexpressionfordetails.ValidatepatternswithsuitesofTests.Save&shareexpressionswithothers.FullRegExReferencewithhelp&examples. Pythex ItisaPython-basedregularexpressiontester.PythexisaquickwaytotestyourPythonregularexpressions.Itcomeswithfourflagsnamely IgnoreCaseMultilineDotAllVerbose Rubular RubularisaRuby-basedregularexpressioneditor.ItsupportsandusestheRuby2.5.7versiononwards. Debuggex ItisJavaScript-basedandsupportsRegExforPythonandPerlCompatibleRegularExpressions(PCRE).UsingthisonlinetoolwecanembedourRegExtoStackOverflow.ItprovidesafacilitytosharetheRegExresultbycreatingauniquelinkagainsteachRegExtest. ExtendsClass ExtendsClassisatoolboxfordevelopers.ItprovidesRegExtestingsupportforthebelowlanguages. JavaScriptPython(3.4)Ruby(2.1)Java(JDK14)PHP(7) RegExTester Thisfreeregularexpressiontesterletsyoutestyourregularexpressionsagainstanyentryofyourchoiceandclearlyhighlightsallmatches.Usingthis,wecansavetheoldtestedRegExforfuturereference.Moreover,itsupportsJavaScriptandPCRERegEx. WebToolKit WebToolkitcontainsasetofutilitytools,RegExtesterisoneofthem.WecaninputourRegExhereandcantestitagainstavalue.Italsoprovidesafacilityforreplacing,matching,andcopyingtheexpressions.Apartfromthis,itprovidesatoggletoperformacase-sensitiveandglobalmatch. LearningResources IfyouwishtolearnRegEx,herearesomeofthebestcoursesavailableonline. Coursera Courseraoffersinterestingguidedprojectcourseswhichwillgiveyouhands-onexperienceusingRegEx.Mostoftheseprojectcourseslastaboutanhourandyouwillbeworkingstep-by-stepalongwiththeinstructor.HerearesomeofthebestRegExprojects. RegularExpressionsinPythonExtractTextDatawithJavaandRegExExtractTextDatawithBashandRegEx Udemy UdemyoffersaCompleteRegExcourseforbeginnerswhichteachesyouthebasicsin3.5hoursandaPythonRegExCoursewithProjectswhichwillgiveyouhands-onexperienceusingRegExforinputvalidation,dataprocessing,andtransformation. Conclusion Welearnedtheregularexpressions,afewcommonexamples,andsomeoftheonlinetestingtools.Withthisknowledge,wecancreateourregularexpressionsandusetheminourapplications. Enjoyedreadingthearticle?Howaboutsharingwiththeworld? 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