正则表达式过滤手机号

- (void)applicationDidBecomeActive:(UIApplication *)application {
    UIPasteboard *paste = [UIPasteboard generalPasteboard];
    if (paste.string.length>=7) {
        
        NSRegularExpression *regular = [NSRegularExpression regularExpressionWithPattern:@"[0-9]" options:0 error:NULL];
        //方法一去掉不符合规则的字符  @"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. }