ios - Regex function to find @ mentions does not work anymore -


xcode 8.3.3

i wrote regex method mentions of string.

func getmentions() -> [string] {     let pattern = "\\b@[a-za-z0-9]+"     {         let regex = try nsregularexpression(pattern: pattern, options: nsregularexpression.options(rawvalue: 0))         let nsstr = self nsstring         let = nsrange(location: 0, length: nsstr.length)         var matches : [string] = [string]()         regex.enumeratematches(in: self, options: nsregularexpression.matchingoptions(rawvalue: 0), range: all) {             (result : nstextcheckingresult?, _, _) in             if let r = result {                 let result = nsstr.substring(with: r.range) string                 matches.append(result)             }         }         log.info(matches)         return matches     } catch {         return []     } }

this used work fine. however, when run this, empty matches. did updated now?

i've tried this:

let pattern = "\\b@[a-za-z0-9]+\\b"


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