代码判断邮箱是否合法

BOOL NSStringIsValidEmail(NSString *checkString) { NString *stricterFilterString = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+//.[A-Za-z]{2,4}"; NSString *laxString = @".+@.+/.[A-Za-z]{2}[A-Za-z]*"; NSString *emailRegex = stricterFilter ? stricterFilterString : laxString; NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex]; return [emailTest evaluateWithObject:checkString]; }  

 

代码用了断言， 如果是正则达人，那更容易理解。