Regular Expression Specific Email Domain(preg_match) [duplicate] - php

Question

This question already has answers here:
How to match all email addresses at a specific domain using regex?
(5 answers)
Closed 4 years ago.
I am new to regular expressions and need some help. I need to use a regular expression to validate an email so it has a specific email so only emails ending in #School.edu work, as of right now i have
$username = $_REQUEST["username"];
$password = $_REQUEST["pass"];
$repeatP = $_REQUEST["repeat"];
//Username is Acceptable, Passwords Match and Appropirate Size
if(preg_match("/^[a-zA-Z0-9]+\oneonta.edu$/i", $username)) {
$userCheck = true;
?> <p>Username is Acceptable</p>
<?
}
else {
?><p>Error: Username is Unacceptable, Please go back and try again</p>
<?
}
I'm using School.edu as an example for my schools edu, I just don't get how to it only allow School.edu emails

Answer 1

one option:
$mystring = '#oneonta.edu';
$pos = strpos($mystring, $_REQUEST["username"]);
if ($pos !== false) {
echo "<p>Username is Acceptable</p>";
} else {
echo "<p>Error: Username is Unacceptable, Please go back and try again</p> ";
}
another
if(substr($_REQUEST["username"], -12)=='#oneonta.edu'){
echo "<p>Username is Acceptable</p>";
}else{
echo "<p>Error: Username is Unacceptable, Please go back and try again</p> ";
}
more ?
$pieces = explode("#", $_REQUEST["username"]);
if($pieces[1]=='oneonta.edu'){
echo "<p>Username is Acceptable</p>";
}else{
echo "<p>Error: Username is Unacceptable, Please go back and try again</p> ";
}