正则表达式—————判断邮箱

+ (BOOL)checkEmail:(NSString *)str {

    

    NSString *emailRegex =@"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";

    NSPredicate *emailTest = [NSPredicatepredicateWithFormat:@"SELF MATCHES %@", emailRegex];

    

    BOOL isMatch = [emailTest evaluateWithObject:str];

    

    if (!isMatch) {

        [SVProgressHUDshowErrorWithStatus:@"请输入正确的邮箱"];

        return NO;

    }

    return YES;

}