iOS开发：常用的一些正则表达式

1.判断邮箱格式是否合法

- (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.判断密码是否合法

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

3.判断手机号码是否合法

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