Regular expression issues in .net 6 value converter

There are some missing parts in your regular expression, for example it doesn't have the curly braces { and } escaped, since curly braces ... Home Public Questions Tags Users Companies Collectives ExploreCollectives Teams StackOverflowforTeams –Startcollaboratingandsharingorganizationalknowledge. CreateafreeTeam WhyTeams? Teams CreatefreeTeam Collectives™onStackOverflow Findcentralized,trustedcontentandcollaboratearoundthetechnologiesyouusemost. Learnmore Teams Q&Aforwork Connectandshareknowledgewithinasinglelocationthatisstructuredandeasytosearch. Learnmore Regularexpressionissuesin.net6valueconverter AskQuestion Asked 3monthsago Modified 3monthsago Viewed 97times 0 Iamtryingtolearnsome.net6andc#andIamstrugglingwithregularexpressionsalot.MorespecificalywithAvaloniainWindowsifthatisrelevant. Iamtryingtodoasmallappwith2textboxes.Iwritetextononeandgetthetext"filtered"intheotheroneusingavalueconverter. Iwouldliketofiltermathexpressionstotrytosolvethemlateron.Somethingsimple,kindofawayofwritingtextmathandgettingresultsrealtime. Ihavebeentryingforseveralweekstofigurethisregularexpressiononmyownwithnosuccesswhatsoever. Iwouldliketoreplaceinmystring"_Expression{BLABLA}"for"BLABLA".FortestingmyexpressionsIhavebeencheckinginhttp://regexstorm.net/andhttps://regex101.com/andaccordingtothemmymatchesshouldbecorrect(unlessImisunderstoodtheresults).ButtheresultsinmylittleappareextremelyoddtomeandIfinallydecidedtoaskforhelp. Hereismycode: privatestaticstring?FilterStr(objectvalue) { if(valueisstringstr) { stringpattern=@"\b_Expression{(.+?)\w*}"; Regexrgx=new(pattern); foreach(Matchmatchinrgx.Matches(str)) { stringaux=""; aux=match.Value; aux=Regex.Replace(aux,@"_Expression{",""); aux=Regex.Replace(aux,@"[\}]",""); str=Regex.Replace(str,match.Value,aux); } returnnewstring(str); } returnnull; } Thentheresultsforsomesampleinputsare: Input: Sometext _Expression{x} _Expression{1} _Expression{4} _Expression{4.5}_Expression{4+4} _Expression{4-4}_Expression{4*x} _Expression{x/x} _Expression{x^4} _Expression{sin(x)} Output: Sometext x 1{1} 1{4} 1{4.5}1{4+4} 1{4-4}1{4*x} 1{x/x} 1{x^4} 1{sin(x)} or Input: Sometext _Expression{x} _Expression{4} _Expression{4.5}_Expression{4+4} _Expression{4-4}_Expression{4*x} _Expression{x/x} _Expression{x^4} _Expression{sin(x)} Output: Sometext x _Expression{4} 4.5_Expression{4+4} 4-4_Expression{4*x} x/x _Expression{x^4} _Expression{sin(x)} Itfeelsveryconfusingtomethisbehaviour.Ican'tseewhy"(.+?)"doesnotworkwithsomeofthemanditdoeswithothers...OrmaybeIhaven'tdefinedsomethingproperlyormyReplaceiswrong?Ican'tseeit... Thanksalotforthetime!:) c#regex.net-6.0ivalueconverter Share Follow askedMar15at10:47 JorgeLLJorgeLL 311bronzebadge Addacomment  |  1Answer 1 Sortedby: Resettodefault Highestscore(default) Trending(recentvotescountmore) Datemodified(newestfirst) Datecreated(oldestfirst) 0 Therearesomemissingpartsinyourregularexpression,forexampleitdoesn'thavethecurlybraces{and}escaped,sincecurlybraceshaveaspecialmeaninginaregularexpression;theyareusedasquantifiers. Usetheonebelow. Forextractingthemathexpressionbetweenthecurlybraces,itusesanamedcapturinggroupwithnamemathExpression. _Expression\{(?.+?)\} _Expression\{:startwiththefixedtext_Expression{ (?:startanamedcapturinggroupwithnamemathExpression .+?:takethenextcharactersinanongreedyway ):endthenamedcapturinggroup \}:endwiththefixedcharacter} Thebelowexamplewilloutput2matches Regexregex=new(@"_Expression\{(?.+?)\}"); varmatches=regex.Matches(@"_Expression{4.5}_Expression{4+4}"); foreach(Matchmatchinmatches.Where(o=>o.Success)) { varmathExpression=match.Groups["mathExpression"]; Console.WriteLine(mathExpression); } Output 4.5 4+4 Share Follow editedMar16at19:26 answeredMar15at23:09 pfxpfx 15.5k4141goldbadges3636silverbadges5252bronzebadges 1 Itworksperfectly.Thanksforthesolutionandthedetailedexplanationpfx,Ican'tbegratefulenough! – JorgeLL Mar16at8:05 Addacomment  |  YourAnswer ThanksforcontributingananswertoStackOverflow!Pleasebesuretoanswerthequestion.Providedetailsandshareyourresearch!Butavoid…Askingforhelp,clarification,orrespondingtootheranswers.Makingstatementsbasedonopinion;backthemupwithreferencesorpersonalexperience.Tolearnmore,seeourtipsonwritinggreatanswers. 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