iOS 郵箱正則表達式。

//進行郵箱正則表達式判斷

-(BOOL) validateEmail
{
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];
}

 

這裡面的self 是因為這個方法是寫在category的 NSString + SiZheString.m 中

所以調取方式應該是

if([@"字符串" validateEmail]){

}

這種樣式

如果是自己不想封裝

NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
Bool isTrue = [emailTest evaluateWithObject:@"字符串"];