用户注册 验证邮箱格式是否正确

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-(BOOL)CheckInput:(NSString *)_text { NSString *Regex=@"[A-Z0-9a-z._%+-]+@[A-Z0-9a-z._]+\\.[A-Za-z]{2,4}"; NSPredicate *emailTest=[NSPredicate predicateWithFormat:@"SELF MATCHES %@",Regex]; return [emailTest evaluateWithObject:_text]; }     - (IBAction)getbackPasswd:(id)sender { if(![self CheckInput:signemailTextField.text]){ UIAlertView *alert=[[UIAlertView alloc]initWithTitle:nil message:@"您的邮箱格式不正确，请检查" delegate:self cancelButtonTitle:@"返回" otherButtonTitles:nil, nil]; [alert show]; } }