Regex example

regex+string.swift

import Foundation

extension String {
    func exec (str: String) -> Array<String> {
        var err : NSError?
        let regex = NSRegularExpression(pattern: self, options: NSRegularExpressionOptions(0), error: &err)
        if err {
            return Array<String>()
        }
        let nsstr = str as NSString
        let all = NSRange(location: 0, length: nsstr.length)
        var matches : Array<String> = Array<String>()
        regex.enumerateMatchesInString(str, options: NSMatchingOptions(0), range: all) {
            (result : NSTextCheckingResult!, _, _) in
            matches.append(nsstr.substringWithRange(result.range))
        }
        return matches
    }
}

let res = "\\w+".exec("Hello world")

println(res) // ["Hello", "world"]

The following works in Swift 2.0:

func exec (str: String) -> Array<String> {
    do {
        let regex = try NSRegularExpression(pattern: self, options: NSRegularExpressionOptions(rawValue: 0))
        let nsstr = str as NSString
        let all = NSRange(location: 0, length: nsstr.length)
        var matches : Array<String> = Array<String>()
        regex.enumerateMatchesInString(str, options: NSMatchingOptions(rawValue: 0), range: all) {
            (result : NSTextCheckingResult?, _, _) in
            let theResult = nsstr.substringWithRange(result!.range)
            matches.append(theResult)
        }
        return matches
    } catch {
        return Array<String>()
    }
}