ios - Replace regex match with attributed string and text -

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our app api returns field custom format user mentions like: "this text mention @(steve|user_id)". before display on uitextview, need process text, find pattern , replace more user friendly. final result "this text mention @steve" @steve should have link attribute user_id. same functionality facebook.

first i've created uitextview extension, match function regex pattern.

extension uitextview {     func processtext(pattern: string) {         let instring = self.text         let regex = try? nsregularexpression(pattern: pattern, options: [])         let range = nsmakerange(0, instring.characters.count)         let matches = (regex?.matchesinstring(instring, options: [], range: range))! [nstextcheckingresult]          let attrstring = nsmutableattributedstring(string: instring, attributes:attrs)          //iterate on regex matches         match in matches {             //properly print match range             print(match.range)             //a basic idea add link attribute on regex match range             attrstring.addattribute(nslinkattributename, value: "\(schememap["@"]):\(must_be_user_id)", range: match.range)             //still text it's in format @(steve|user_id) how replace @steve keeping link attribute ?         }     } }  //to use let regex = ""\\@\\(([\\w\\s?]*)\\|([a-za-z0-9]{24})\\)"" mytextview.processtext(regex)

this have right now, i'm stucked trying final result

thanks lot !

i changed regex bit, got pretty result. modified code little well, can test directly in playgrounds.

func processtext() -> nsattributedstring {     let pattern = "(@\\(([^|]*)([^@]*)\\))"     let instring = "this text mention @(steve|user_id1) , @(alan|user_id2)."     let regex = try? nsregularexpression(pattern: pattern, options: [])     let range = nsmakerange(0, instring.characters.count)     let matches = (regex?.matchesinstring(instring, options: [], range: range))!      let attrstring = nsmutableattributedstring(string: instring, attributes:nil)     print(matches.count)     //iterate on regex matches     match in matches.reverse() {         //properly print match range         print(match.range)          //get username , userid         let username = attrstring.attributedsubstringfromrange(match.rangeatindex(2)).string         let userid = attrstring.attributedsubstringfromrange(match.rangeatindex(3)).string          //a basic idea add link attribute on regex match range         attrstring.addattribute(nslinkattributename, value: "\(userid)", range: match.rangeatindex(1))          //still text it's in format @(steve|user_id) how replace @steve keeping link attribute ?         attrstring.replacecharactersinrange(match.rangeatindex(1), withstring: "@\(username)")     }     return attrstring }

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