1.判斷郵箱格式是否合法

- (BOOL) isEmail {
    NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
    return [emailTest evaluateWithObject:self];
}

2.判斷密碼是否合法

- (BOOL) isPassword {
    NSString *passWordRegex = @"^(?=.*[0-9].*)(?=.*[A-Z].*)(?=.*[a-z].*).{8,}$";
    NSPredicate *passWordPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",passWordRegex];
    return [passWordPredicate evaluateWithObject:self];
}

3.判斷手機(jī)號(hào)碼是否合法

- (BOOL)isPhone {
    NSString * regex=@"^1\\d{10}$";
    NSPredicate *regexPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
    return [regexPredicate evaluateWithObject:self];
}

4.IPV4

^(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9])\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])$

不嚴(yán)謹(jǐn)：
((25[0-5]|2[0-4]\d|((1\d{2})|([1-9]?\d)))\.){3}(25[0-5]|2[0-4]\d|((1\d{2})|([1-9]?\d)))