正規表現のサンプル ref: http://qiita.com/externvoid@github/items/0660b70db9e373169980

foo.swift

import Foundation
let str: NSString = NSString(string: "Charlie Brown")
let a:NSRange = str.rangeOfString("Brown")
print(a.location)
print(a.length)
print(NSNotFound)
var ar: NSArray
do {
let reg: NSRegularExpression = try NSRegularExpression(pattern: "Brown",
                 options: NSRegularExpressionOptions.UseUnicodeWordBoundaries)
let str0 = str as String
let match: NSTextCheckingResult? = reg.firstMatchInString(str0,
                         options: NSMatchingOptions.ReportCompletion,
                         range: NSMakeRange(0, str.length))
print(match)
print(match!.range)                                                             
} catch {}