使用正则表达式验证电子邮件地址,不接受两个字符扩展名,如 .in .co 等
BOOL stricterFilter = NO;
NSString *stricterFilterString = @"^[A-Z0-9a-z\._%+-]+@([A-Za-z0-9-]+\.)+[A-Za-z]{2,4}$";
NSString *laxString = @"^.+@([A-Za-z0-9-]+\.)+[A-Za-z]{2}[A-Za-z]*$";
NSString *emailRegex = stricterFilter ? stricterFilterString : laxString;
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
使用这个
#pragma mark - Valid Email
+ (BOOL)isValidEmail:(NSString*)email
{
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:email];
}
您只需要签入laxString
如下所示:
NSString *laxString = @".+@([A-Za-z0-9-]+\.)+[A-Za-z]{2}[A-Za-z]*";
然后检查必须工作
以下是我的工作代码:
- (BOOL)validateEmailWithString:(NSString*)checkString
{
NSString *stricterFilterString = @"[A-Z0-9a-z\._%+-]+@([A-Za-z0-9-]+\.)+[A-Za-z]{2,4}";
NSString *laxString = @".+@([A-Za-z0-9-]+\.)+[A-Za-z]{2}[A-Za-z]*";
NSString *emailRegex = stricterFilter ? stricterFilterString : laxString;
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
return [emailTest evaluateWithObject:checkString];
}
验证下面的电子邮件
- (BOOL)validateEmail:(NSString *)email
{
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:email];
}
验证电子邮件后,在电子邮件末尾签入 .in 或不使用以下代码
NSString *lastThreeChar = [yourNewString substringFromIndex:[txt_Email.text length] - 3];
if ([lastThreeChar isEqualToString:@".in"])
{
// email_id contain .in
}
else{
// email_id dosen't contain .in
}
-(BOOL)validateEmail {
//Email address field should give an error when the email address begins with ".","-","_" .
// Works well with @me.com.
NSString *emailRegex = @"[A-Z0-9a-z]([A-Z0-9a-z._-]{0,64})+[A-Z0-9a-z]+@[A-Z0-9a-z]+([A-Za-z0-9.-]{0,64})+([A-Z0-9a-z])+\.[A-Za-z]{2,4}";
NSPredicate *emailPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
return ([emailPredicate evaluateWithObject:self.text] && self.text.length <= 64 && ([self.text rangeOfString:@".."].location == NSNotFound));
}