HAVE YOU EVER VALIDATED AN EMAIL?
HOW DID YOU DO IT?
There are thousands of techniques lets share both public and self developed methods.
As a means to keep the fire burning. I appeal to programmers to see this thread as a repository that you can always come back to check.
RULES-
;-> NO MORE RULES
I thinks its time we talked about which is poor and the possible flaws.

@Pattern(regexp="[a-z0-9!#$%&’*+/=?^_‘{|}~-]+(?:\\."
+"[a-z0-9!#$%&’*+/=?^_‘{|}~-]+)*@"
+"(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?",
message="{invalid.email}"
private String email;

That was a validation method I once used with java. I got the regular expression from a java6 ee reference material

<?php
$email =$_POST['email'];
if(!filter_var($email, FILTER_VALIDATE_EMAIL))
{
echo "E-mail is not valid";
}
else
{
echo "E-mail is valid";
}

I would say php made that easier than it is in java

This method is so poor. And i doubt if php developers are willing to replace it for now. With this method brackets will still be allowed as input even quotes

That regular expression stuff is almost perfect if not perfect

You can always create a self developed one that checks for each symbol

<?php
$email = $_POST['email'] ;
if(preg_match('/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/', $email))
{
echo "valid email"

}else
{
echo "invalid email" ;
}

i use this mostly though

<?php
$email=$_POST['email'];
if(filter_var($email,FILTER_VALIDATE_EMAIL) === TRUE)
{
echo 'valid Email';
}
else
{
echo 'invalid email';
}

ToyinDipo: @Pattern(regexp="[a-z0-9!#$%&’*+/=?^_‘{|}~-]+(?:\\."
+"[a-z0-9!#$%&’*+/=?^_‘{|}~-]+)*@"
+"(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?",
message="{invalid.email}"
private String email;

That was a validation method I once used with java. I got the regular expression from a java6 ee reference material

this raises a question of what is the proper set of allowed xters. This regular exp. Allows #* which i have never noticed in anyone's email address a good modification will be to simply reduce the accepted Xters. Also with php you will have to escape these special xters "^.[$()|*+?{/\" they have special meanings

Kidstell:
this raises a question of what is the proper set of allowed xters. This regular exp. Allows #* which i have never noticed in anyone's email address a good modification will be to simply reduce the accepted Xters. Also with php you will have to escape these special xters "^.[$()|*+?{/\" they have special meanings

It was experts that actually created that regexp. I believe they allowed the use of #* not because people use them, but because it is permissible. For instance in oracle, you can begin a variable name with _ or $, but conventionally it's not advisable, so people tend to begin variable names only with letters.

Gradually our nairaland is getting better. Watch out for the next edition of PHP Workouts II- the topic was initially 9jerian phone number but its been solved already. Conclusively the best answer was given by Bro. Toyin Dipo using java (modified for php)
<?php
$email =$_POST['email'] ;
if(preg_match('/[a-z0-9!#\$%&’\*\+\/=\?\^_‘\{\|\}~-]+(?:\\."
\+"[a-z0-9!#\$%&’\*\+\/=\?\^_‘\{\|\}~-]+)*@"
+"(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?/', $email))
{
echo "valid email"
}else
{
echo "invalid email" ;
}
but to apply this solution in php be sure to escape the special characters try it post your correction because this moderator knows nothing about lamp or wamp. GOD BLESS MY BRETHREN.

Kidstell: Gradually our nairaland is getting better. Watch out for the next edition of PHP Workouts II- the topic was initially 9jerian phone number but its been solved already. Conclusively the best answer was given by Bro. Toyin Dipo using java (modified for php)
<?php
$email =$_POST['email'] ;
if(preg_match('/[a-z0-9!#\$%&’\*\+\/=\?\^_‘\{\|\}~-]+(?:\\."
\+"[a-z0-9!#\$%&’\*\+\/=\?\^_‘\{\|\}~-]+)*@"
+"(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?/', $email))
{
echo "valid email"
}else
{
echo "invalid email" ;
}
but to apply this solution in php be sure to escape the special characters try it post your correction because this moderator knows nothing about lamp or wamp. GOD BLESS MY BRETHREN.

I'm humbled bro. Thanks.

Next is a topic that is very far from beginners plight but please quick around don't be discouraged. Make it your challenge as we all discuss sqlite3 php classes