swift的正则表达式(NSRegularExpression)

by 伍雪颖

import UIKit

class ViewController:
UIViewController {

override
func viewDidLoad() {

super.viewDidLoad()

let mailPattern =

"^([a-z0-9_\\.-]+)@([\\da-z\\.-]+)\\.([a-z\\.]{2,6})$"

let matcher =
RegexHelper(mailPattern)

let maybeMailAddress =
"[email protected]"

if matcher.match(maybeMailAddress)
{

println("valid email")

}

}

struct RegexHelper {

let regex:
NSRegularExpression?

init(_
pattern: String) {

var error:
NSError?

regex =
NSRegularExpression(

pattern: pattern,

options: .CaseInsensitive,

error: &error)

}

func match(input:
String) ->
Bool {

if
let matches =
regex?.matchesInString(input,

options: nil,

range: NSMakeRange(0,
count(input))) {

return matches.count
> 0

} else {

return
false

}

}

}

}

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