Java Regular Expression Tester - FreeFormatter.com

This free Java regular expression tester lets you test your regular expressions against any entry of your choice and clearly highlights all matches. 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Javaregularexpression Texttotestagainst Replacestring(optional) *Youcanusematchedgroupswith$1,$2,etc.'\t','\n','\r'arealsosupported. Dotall Multiline Unixlines CanonEQ Literal Unicodecase Unicodecharacterclass Testmatch Replacefirst Replaceall RegularExpression-Documentation Character Whatdoesitdo? \ UsedtoindicatethatthenextcharactershouldNOTbeinterpretedliterally.Forexample,thecharacter'w'byitselfwillbeinterpretedas 'matchthecharacterw',butusing'\w'signifies'matchanalpha-numericcharacterincludingunderscore'. Usedtoindicatethatametacharacteristobeinterpretedliterally.Forexample,the'.'metacharactermeans'matchanysinglecharacterbutanewline',butif wewouldrathermatchadotcharacterinstead,wewoulduse'\.'. ^ Matchesthebeginningoftheinput.Ifinmultilinemode,italsomatchesafteralinebreakcharacter,henceeverynewline. Whenusedinasetpattern([^abc]),itnegatestheset;matchanythingnotenclosedinthebrackets $ Matchestheendoftheinput.Ifinmultilinemode,italsomatchesbeforealinebreakcharacter,henceeveryendofline. * Matchestheprecedingcharacter0ormoretimes. + Matchestheprecedingcharacter1ormoretimes. ? Matchestheprecedingcharacter0or1time. Whenusedafterthequantifiers*,+,?or{},makesthequantifiernon-greedy;itwillmatch theminimumnumberoftimesasopposedtomatchingthemaximumnumberoftimes. . Matchesanysinglecharacterexceptthenewlinecharacter. (x) Matches'x'andremembersthematch.Alsoknownascapturingparenthesis. (?:x) Matches'x'butdoesNOTrememberthematch.AlsoknownasNON-capturingparenthesis. x(?=y) Matches'x'onlyif'x'isfollowedby'y'.Alsoknownasalookahead. x(?!y) Matches'x'onlyif'x'isNOTfollowedby'y'.Alsoknownasanegativelookahead. x|y Matches'x'OR'y'. {n} Matchestheprecedingcharacterexactlyntimes. {n,m} Matchestheprecedingcharacteratleastntimesandatmostmtimes.nandmcanbeomittedifzero.. [abc] Matchesanyoftheenclosedcharacters.Alsoknownasacharacterset. YoucancreaterangeofcharactersusingthehyphencharactersuchasA-Z(AtoZ).Notethatincharactersets, specialcharacters(.,*,+)donothaveanyspecialmeaning. [^abc] MatchesanythingNOTenclosedbythebrackets.Alsoknownasanegativecharacterset. [\b] Matchesabackspace. \b Matchesawordboundary.BoundariesaredeterminedwhenawordcharacterisNOTfollowedorNOTprecededwithanotherwordcharacter. \B MatchesaNON-wordboundary.BoundariesaredeterminedwhentwoadjacentcharactersarewordcharactersORnon-wordcharacters. \cX Matchesacontrolcharacter.XmustbebetweenAtoZinclusive. \d Matchesadigitcharacter.Sameas[0-9]or[0123456789]. \D MatchesaNON-digitcharacter.Sameas[^0-9]or[^0123456789]. \f Matchesaformfeed. \n Matchesalinefeed. \r Matchesacarriagereturn. \s Matchesasinglewhitespacecharacter.Thisincludesspace,tab,formfeedandlinefeed. \S MatchesanythingOTHERthanasinglewhitespacecharacter.Anythingotherthanspace,tab,formfeedandlinefeed. \t Matchesatab. \v Matchesaverticaltab. \w Matchesanyalphanumericcharacterincludingunderscore.Equivalentto[A-Za-z0-9_]. \W MatchesanythingOTHERthananalphanumericcharacterincludingunderscore.Equivalentto[^A-Za-z0-9_]. \x Abackreferencetothesubstringmatchedbythexparentheticalexpression.xisapositiveinteger. \0 MatchesaNULLcharacter. \xhh Matchesacharacterwiththe2-digitshexadecimalcode. \uhhhh Matchesacharacterwiththe4-digitshexadecimalcode. RegularExpression-Solutionstocommonproblems HowcanIemulateDOTALLinJavaScript? DOTALLisaflaginmostrecentregexlibrariesthatmakesthe.metacharactermatchanythingINCLUDINGlinebreaks.JavaScriptbydefaultdoes notsupportthissincethe.metacharactermatchesanythingBUTlinebreaks.Toemulatethisbehavior,simplyreplacesall.metacharacters by[\S\s].ThismeansmatchanythingthatisasinglewhitespacecharacterORanythingthatisnotawhitespacecharacter! [\S\s] HowtovalidateanEMAILaddresswitharegularexpression? Thereisno100%reliablesolutionsincetheRFCiswaytoocomplex.Thisisthebestsolutionandshouldwork99%ofthetimeis.Consultthispage formoredetailsonthisproblem.Alwaysturnoffcasesensitivity! ^[-a-z0-9~!$%^&*_=+}{\'?]+(\.[-a-z0-9~!$%^&*_=+}{\'?]+)*@([a-z0-9_][-a-z0-9_]*(\.[-a-z0-9_]+)*\.(aero|arpa|biz|com|coop|edu|gov|info|int|mil|museum|name|net|org|pro|travel|mobi|[a-z][a-z])|([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}))(:[0-9]{1,5})?$ HowtovalidateanIPaddress(IPV4)witharegularexpression? ThiswillmakesurethateverynumberintheIPaddressisbetween0and255,unliketheversionusing\d{1,3}whichwouldallowfor999.999.999.999. IfyouwanttomatchanIPwithinastring,getridoftheleading^andtrailing$touse\b(wordboundaries)instead. ^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$ HowtovalidateaDATEwitharegularexpression? Neverusearegularexpressiontovalidateadate.Theregularexpressionisonlyusefultovalidatetheformatofthedateasenteredbyauser.Fortheactualdatevalidity,it'sbettertorelyonactualcode. ThefollowingexpressionswillvalidatethenumberofdaysinamonthbutwillNOThandleleapyearvalidation;hencefebruarycanhave29dayseveryyear,butnotmore. ISOdateformat(yyyy-mm-dd) ^[0-9]{4}-(((0[13578]|(10|12))-(0[1-9]|[1-2][0-9]|3[0-1]))|(02-(0[1-9]|[1-2][0-9]))|((0[469]|11)-(0[1-9]|[1-2][0-9]|30)))$ ISOdateformat(yyyy-mm-dd)withseparators'-'or'/'or'.'or''.Forcesusageofsameseparatoracrossdate. ^[0-9]{4}([-/.])(((0[13578]|(10|12))\1(0[1-9]|[1-2][0-9]|3[0-1]))|(02\1(0[1-9]|[1-2][0-9]))|((0[469]|11)\1(0[1-9]|[1-2][0-9]|30)))$ UnitedStatesdateformat(mm/dd/yyyy) ^(((0[13578]|(10|12))/(0[1-9]|[1-2][0-9]|3[0-1]))|(02/(0[1-9]|[1-2][0-9]))|((0[469]|11)/(0[1-9]|[1-2][0-9]|30)))/[0-9]{4}$ Hoursandminutes,24hoursformat(HH:MM) ^(20|21|22|23|[01]\d|\d)((:[0-5]\d){1,2})$ HowtovalidateNUMBERSwitharegularexpression? Itdepends.Whattypeofnumber?Whatprecision?Whatlength?Whatdoyouwantasadecimalseparator?Thefollowingexamplesshouldhelpyouwantwiththemostcommontasks. Positiveintegersofundefinedlength ^\d+$ Positiveintegersofmaximumlength(10inourexample) ^\d{1,10}$ Positiveintegersoffixedlength(5inourexample) ^\d{5}$ Negativeintegersofundefinedlength ^-\d+$ Negativeintegersofmaximumlength(10inourexample) ^-\d{1,10}$ Negativeintegersoffixedlength(5inourexample) ^-\d{5}$ Integersofundefinedlength ^-?\d+$ Integersofmaximumlength(10inourexample) ^-?\d{1,10}$ Integersoffixedlength(5inourexample) ^-?\d{5}$ Numbersofundefinedlengthwithorwithoutdecimals(1234.1234) ^-?\d*\.{0,1}\d+$ Numberswith2decimals(.00) ^-?\d*\.\d{2}$ Currencynumberswithoptionaldollarsignandthousandseparatorsandoptional2decimals($1,000,00.00,10000.12,0.00) ^$?\-?([1-9]{1}[0-9]{0,2}(\,\d{3})*(\.\d{0,2})?|[1-9]{1}\d{0,}(\.\d{0,2})?|0(\.\d{0,2})?|(\.\d{1,2}))$|^\-?$?([1-9]{1}\d{0,2}(\,\d{3})*(\.\d{0,2})?|[1-9]{1}\d{0,}(\.\d{0,2})?|0(\.\d{0,2})?|(\.\d{1,2}))$|^\($?([1-9]{1}\d{0,2}(\,\d{3})*(\.\d{0,2})?|[1-9]{1}\d{0,}(\.\d{0,2})?|0(\.\d{0,2})?|(\.\d{1,2}))\)$ Percentagefrom0to100withoptional2decimalsandoptional%signattheend(0,0.00,100.00,100%,99.99%) ^-?[0-9]{0,2}(\.[0-9]{1,2})?%?$|^-?(100)(\.[0]{1,2})?%?$ Howtovalidatefeetandincheswitharegularexpression? ThenotationforfeetandinchesisF'I".Possiblevalueswouldbe0'0",6'11",12456'44" ^\d+'(\d|1[01])"$ Howtovalidateanhexadecimalcolorcode(#FFFFFF)witharegularexpression? Theleading#signisoptionalandthecolorcodecantakeeitherthe6or3hexadecimaldigitsformat. ^#?([a-f0-9]{6}|[a-f0-9]{3})$ HowtocheckforALPHANUMERICvalueswitharegularexpression? Youcouldmakeuseof\w,butitalsotoleratestheunderscorecharacter. ^[a-zA-Z0-9]+$ HowtovalidateaSSN(SocialSecurityNumber)witharegularexpression? Unlikemanyothersimilarnumberssuchasthecanadiansocialinsurancenumber(SIN)thereisnochecksumforaSSN.ValidatingtheformatoftheSSNdoesnotmeanit'svalidpersaythough. ^\d{3}-?\d{2}-?\d{4}$ HowtovalidateaSIN(SocialInsuranceNumber)witharegularexpression? Thiswillonlyvalidatetheformat.ASINshouldalsobevalidatedbycomputingthechecksumdigit.ThisregexwilltoleratetheformXXXXXXXXX,XXXXXXXXorXXX-XXX-XXX.Notethatthegroupseparatormustbethesame. ^\d{3}([\s-])?\d{3}\1\d{3}$ HowtovalidateaUSZipCodewitharegularexpression? TheUnitedStatesPostalServicesmakesuseofzipcodes.Zipcodeshave5digitsOR9digitsinwhatisknownasaZip+4. ZipCode(99999) ^\d{5}$ ZipandZip+4(99999-9999) ^\d{5}(-\d{4})?$ HowtovalidateaCanadianPostalCodewitharegularexpression? TheCanadianPostalServicesusespostalcode.ThepostalcodesareinformatX9X9X9.Thiswilltolerateaspacebetweenthefirstandsecondgroup. ^[ABCEGHJKLMNPRSTVXY]{1}\d{1}[A-Z]{1}*\d{1}[A-Z]{1}\d{1}$ Howtoextractthefilenameinawindowspathusingaregularexpression? Sinceeverypartofapathisseparatedbya\character,weonlyneedtofindthelastone.Notethatthere'sjustnowaytocheckifthelastportionofapathisafileoradirectoryjustbythenamealone.Youcouldtrytomatchforanextension,butthere'snorequirementforafiletohaveanextension. [^\\]+$ HowtovalidateaUSorCanadiantelephonenumberusingaregularexpression? Thereareprobablydozensofwaytoformataphonenumber.Youruserinterfaceshouldtakecareoftheformattingproblembyhavingacleardocumentationontheformatand/orsplitthephoneintoparts(area,exchange,number)and/orhaveanentrymask.Thefollowingexpressionisprettylenientontheformatandshouldaccept999-999-9999,9999999999,(999)999-9999. ^(\d{10})|(([\(]?([0-9]{3})[\)]?)?[\.\-]?([0-9]{3})[\.\-]([0-9]{4}))$ Howtovalidatecreditcardsusingaregularexpression? Again,youshouldrelyonothermethodssincetheregularexpressionsherewillonlyvalidatetheformat.MakeuseoftheLuhnalgorithmtoproperlyvalidateacard. ^(\d{10})|(([\(]?([0-9]{3})[\)]?)?[\.\-]?([0-9]{3})[\.\-]([0-9]{4}))$ VISA ^4[0-9]{12}(?:[0-9]{3})?$ VISA ^5[1-5][0-9]{14}$ AmericanExpress ^3[47][0-9]{13}$ DinersClub ^3(?:0[0-5]|[68][0-9])[0-9]{11}$ Discover ^6(?:011|5[0-9]{2})[0-9]{12}$ JCB ^(?:2131|1800|35\d{3})\d{11}$ HowdoIstripallHTMLtagsfromastring? Makesuretobeinglobalmode(gflag),caseinsensitiveandtohavethedotalloptionon.ThisregularexpressionwillmatchallHTMLtagsandtheirattributes.ThiswillLEAVEthecontentofthetagswithinthestring. HowcanIremoveallblanklinesfromastringusingregularexpression? Makesuretobeinglobalandmultilinemode.Useanemptystringasareplacementvalue. ^\s*\r?\n