正則表達式過濾手機號

最近寫了手機衛士，有個小需求是將系統任何地方復制得到的手機號碼 粘貼到自己的手機衛士App中查詢該號碼信息，那么就有個去特殊符號的問題，只留數字，另外需要自動粘貼到自己App輸入框，所以呢在 下面的方法 獲取粘貼板內容並處理號碼為純數字結果：（PS ：最近流行的微信復制淘寶鏈接內容，打開淘寶即可跳轉到相應的 頁面，使用的也是此技術要點，當下搬運工，參考：http://www.jianshu.com/p/10a6900cc904）

- (void)applicationDidBecomeActive:(UIApplication *)application {
    UIPasteboard *paste = [UIPasteboard generalPasteboard];
    if (paste.string.length>=7) {
        
        NSRegularExpression *regular = [NSRegularExpression regularExpressionWithPattern:@"[0-9]" options:0 error:NULL];
        //方法一去掉不符合規則的字符  @"a-zA-Z.-*#";
//        NSString *resultString = [regular stringByReplacingMatchesInString:paste.string options:0 range:NSMakeRange(0, paste.string.length) withTemplate:@""];
//        NSLog(@"pasteBoardString = %@ result = %@",paste.string,resultString);
        
        NSArray *arr =[regular matchesInString:paste.string options:0 range:NSMakeRange(0, paste.string.length)];
        NSString *string = @"";
        for (NSTextCheckingResult *res in arr) {
            string = [string stringByAppendingFormat:@"%@",[paste.string substringWithRange:res.range]];
        }
        NSLog(@"phone number = %@",string);
　　　　　

        if (string.length>=7) {
            BaseNavigationController * nav =  (BaseNavigationController *)self.window.rootViewController;
            
            if ([nav.topViewController isKindOfClass:[ViewController class]]) {
                ViewController *rootVC = (ViewController *)nav.topViewController;
                rootVC.pastenNmber = string;
                paste.string = @"";
            }
        }

 

　 } // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface. }