Translate text into regular expression - MATLAB regexptranslate

newStr = regexptranslate( op , str ) translates str into a regular expression and returns the result in newStr . Skiptocontent HelpCenterHelpCenter SearchHelpCenter HelpCenter MathWorks SearchMathWorks.com MathWorks Support CloseMobileSearch OpenMobileSearch Off-CanvasNavigationMenuToggle DocumentationHome MATLAB LanguageFundamentalsDataTypesCharactersandStrings regexptranslate Onthispage SyntaxDescriptionExamplesTranslateSpecialCharacterEscapeSpecialCharactersinReplacementTextTranslateWildcardCharactersReplaceTextwithRegularExpressionInputArgumentsopstrVersionHistorySeeAlso DocumentationExamplesFunctionsAppsVideosAnswers TrialSoftware TrialSoftware ProductUpdates ProductUpdates Resources DocumentationExamplesFunctionsAppsVideosAnswers MainContent regexptranslateTranslatetextintoregularexpressioncollapseallinpage SyntaxnewStr=regexptranslate(op,str)DescriptionexamplenewStr=regexptranslate(op,str)translatesstrinto aregularexpressionandreturnstheresultinnewStr. YoucanusenewStrasaregularexpressionintheregexp,regexpi, andregexprepfunctions.Theinputargumentopspecifies thetypeoftranslationthatregexptranslateperforms. Forexample,ifyouspecifyopas'escape', thenregexptranslatetranslatesspecialcharacters instrsothattheyareliteralcharactersinthe output.newStrhasthesamedatatypeasstr.ExamplescollapseallTranslateSpecialCharacterOpenLiveScriptTranslateaspecialcharacterinacharactervectorusingtheregexptranslatefunction.Thenusetheresultasaregularexpressioninregexp.Createacharactervectorthatcontainsthecharacters'\n'.chr='Thesequence\ngeneratesanewline.'chr= 'Thesequence\ngeneratesanewline.' Createaregularexpressionthatfinds'\n'asasequenceofthetwoconsecutivecharacters'\'and'n'.Sincetheregexpfunctioninterprets'\n'asanewlinecharacter,useregexptranslatetocreatearegularexpressiontoescape'\n'.pattern=regexptranslate('escape','\n')pattern= '\\n' Findthestartingindexof'\n'inchr.Topreventregexpfrominterpreting'\n'asanewline,usepatternastheregularexpression.idx=regexp(chr,pattern)idx=14 Callregexpwithoutescaping'\n'.Sinceregexpinterprets'\n'asanewline,itdoesnotfindtheliteralcharactersinchr.Theregexpfunctionreturnsanemptyarraywhenitdoesnotfindamatch.idx=regexp(chr,'\n')idx= [] EscapeSpecialCharactersinReplacementTextOpenLiveScriptCreateastring.str="Putyourmoneyin."str= "Putyourmoneyin." Specifythetext,'$0.02',asthetexttoreplacetheword'money'.Toescapethe'$'and'.'characters,useregexptranslate.r=regexptranslate('escape','$0.02')r= '\$0\.02' Replace'money'usingtheregexprepfunction.newStr=regexprep(str,'money',r)newStr= "Putyour$0.02in." TranslateWildcardCharactersOpenLiveScriptCreateastringarraythatcontainsfilenames.Thenfindonlythefilenamesthatendwith'.mat'.str=["test1.mat","myfile.mat","my-matlab-script.m",... "jan30.mat","table3.xls"]str=1x5string Columns1through4 "test1.mat""myfile.mat""my-matlab-script.m""jan30.mat" Column5 "table3.xls" Tomatchstringswitharegularexpression,specify'*.mat'astheregularexpression.Thentranslatethewildcardcharacter,'*',usingtheregexptranslatefunction.pattern=regexptranslate('wildcard','*.mat')pattern= '.*\.mat' Findmatchingelementsinstrusingtheregularexpressionspecifiedbypattern.matches=regexp(str,pattern)matches=1×5cellarray {[1]}{[1]}{0x0double}{[1]}{0x0double} Createalogicalarray,TF,thatcontains1wherecorrespondingelementsofstrmatchedpattern.ThenindexintostrusingTFtodisplaythefilenamesthatendwith'.mat'.tf=~cellfun('isempty',matches); newStr=str(tf)newStr=1x3string "test1.mat""myfile.mat""jan30.mat" ReplaceTextwithRegularExpressionOpenLiveScriptCreateacharactervectorthatcontainswordsseparatedbywhitespacecharacters,suchasspacesandnewlinecharacters.chr='WhosewoodstheseareIthinkIknow.'; chr=[chrnewline'Hishouseisinthevillagethough']chr= 'WhosewoodstheseareIthinkIknow. Hishouseisinthevillagethough' Specify'\s'asaregularexpressionthatmatcheswhitespacecharacters.Thenreplacethosecharactersinchr.expression='\s'; newChr=regexptranslate('flexible',chr,expression)newChr= 'Whose\swoods\sthese\sare\sI\sthink\sI\sknow.\sHis\shouse\sis\sin\sthe\svillage\sthough' InputArgumentscollapseallop—Translationtype'escape'|'wildcard'|'flexible' Typeoftranslation,specifiedasacharactervectororstring scalar.Youcantranslatespecialcharactersorwildcardcharacters, orreplacetextwithamatchingregularexpression,usingtheoptions inthetable. TypeofTranslationDescription'escape'Translateallspecialcharactersinstr, suchas'$','.','?','[', sothattheyaretreatedasliteralcharacterswhenusedinregexp,regexpi, andregexprep.Thetranslationinsertsabackslash, orescape,character,'\',beforeeachspecial characterinstr.'wildcard'Translateallwildcardand'.'characters instrsothattheyaretreatedasliteralwildcard charactersandperiodswhenusedinregexp,regexpi, andregexprep.Thetranslationreplacesallinstances of'*'with'.*',allinstances of'?'with'.',andallinstances of'.'with'\.'.'flexible'Replacetextinstrwitharegular expressionthatmatchesthetext.Ifyouspecify'flexible', thenalsospecifyaregularexpressiontouseasareplacement:newStr =regexptranslate('flexible',str,expression).Theexpressioninput canbeacharactervectororstringscalar.Thissyntax isequivalenttonewStr=regexprep(str,expression,regexptranslate('escape',expression)). str—Inputtextcharactervector|cellarrayofcharactervectors|stringarray Inputtext,specifiedasacharactervector,acellarrayof charactervectors,orastringarray. VersionHistoryIntroducedbeforeR2006aSeeAlsoregexpi|regexprep|regexp|strfind|strjoin|strsplit|strrep|contains|replaceTopicsRegularExpressions × OpenExample Youhaveamodifiedversionofthisexample.Doyouwanttoopenthisexamplewithyouredits? No,overwritethemodifiedversion Yes × MATLABCommand YouclickedalinkthatcorrespondstothisMATLABcommand: RunthecommandbyenteringitintheMATLABCommandWindow. WebbrowsersdonotsupportMATLABcommands. Close × SelectaWebSite Chooseawebsitetogettranslatedcontentwhereavailableandseelocaleventsandoffers.Basedonyourlocation,werecommendthatyouselect:. Switzerland(English) Switzerland(Deutsch) Switzerland(Français) 中国(简体中文) 中国(English) Youcanalsoselectawebsitefromthefollowinglist: HowtoGetBestSitePerformance SelecttheChinasite(inChineseorEnglish)forbestsiteperformance.OtherMathWorkscountrysitesarenotoptimizedforvisitsfromyourlocation. 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