regex - Error after updating to xcode 7 : Cannot invoke initializer for type 'NSRegularExpression' with an argument list of type -

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get following error after updating xcode: "cannot invoke initializer type 'nsregularexpression' argument list of type '(pattern: string, options: nilliteralconvertible, error: nilliteralconvertible)'"

following code cause error:

        func applystylestorange(searchrange: nsrange) {     let normalattrs = [nsfontattributename : uifont.preferredfontfortextstyle(uifonttextstylebody)]     // iterate on each replacement     (pattern, attributes) in replacements {         let regex = nsregularexpression(pattern: pattern, options: nil, error: nil)!         regex.enumeratematchesinstring(backingstore.string, options: nil, range: searchrange) {             match, flags, stop in             // apply style             let matchrange = match.rangeatindex(1)             self.addattributes(attributes, range: matchrange)              // reset style original             let maxrange = matchrange.location + matchrange.length             if maxrange + 1 < self.length {                 self.addattributes(normalattrs, range: nsmakerange(maxrange, 1))             }         }     }

error @ line:- let regex = nsregularexpression(pattern: pattern, options: nil, error: nil)! please suggest me how resolve it.

the initalizer throwable , needs option:

do {     let regex = try nsregularexpression(pattern: "youpattern", options: nsregularexpressionoptions.caseinsensitive) } catch {     print(error) }

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