Verifying email address

i have this code "Matching patterns" that i learned from my
book that i am studying. Apparently it makes it able for me to
check if my users have given me a valid email address. How does it
work? Have i got the proper php code ?
Here is the code i have, hope someone can help me out .
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0
Transitional//EN" "
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="
http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html;
charset=iso-8859-1" />
<title>Testing Regular Expression
Patterns</title>
</head>
<body>
<?php // Script 13.1 - test_pattern.php
// This script takes a submitted string and checks it against
a submitted pattern.
// Address error handling.
ini_set ('display_errors', 1);
error_reporting (E_ALL & ~E_NOTICE);
if ( isset ($_POST['submit'])) { // Has the form been
submitted ?
if (ini_get('magic_quotes_gpc')) { // Adjust if Magic Quotes
is turned on.
$pattern = stripslashes ($_POST['pattern']);
$string = stripslashes ($_POST['string']);
} else { // Use the posted value as is.
$pattern = $_POST['pattern'];
$string = $_POST['string'];
// Trim off extraneous spaces, just in case.
$pattern = trim ($pattern);
$string = trim ($string);
// Print the results.
print "<p>The result of checking<br
/><i>$string</i><br />against<br
/><b>$pattern</b><br />is ";
if (eregi ($pattern, $string) ) {
print 'TRUE!</p>';
} else {
print 'FALSE!</p>';
} else { // Form has not been submitted.
// Set the variables to blank values.
$string = '';
$pattern = '';
// Display the HTML form.
?>
<form action="test_pattern.php" method="post">
<p>Regular Expression Pattern: <input type="text"
name="pattern" value="<?php print $pattern; ?>" size="50"
/></p>
<p>Test String: <input type="text" name="string"
value="<?php print $string; ?>" size="50" /></p>
<input type="submit" name="submit" value="Test!" />
</form>
</body>
</html>
I want to be able to verify my users email address to make
sure they gave me a valid address.
Thank you so much

TTal wrote:
> You cannot check to see if an email address is valid as
in 'in use' or not.
> You can only check to see if the pattern of letters and
numbers that the
> user has entered would constitute a valid email address
format.
Correct.
Luis, I know that you're using a book by Larry Ullman, whose
PHP books
enjoy a good reputation. However, unless you have
misunderstood the
lesson, the code that you posted is close to useless. The
only way in
which you could use it is to test a regular expression.
If you want to find a regular expression to test the script,
do a Google
search for email regular expression. It needs to be a POSIX
regular
expression, because the script uses eregi(). I suspect Larry
Ullman has
used eregi() because POSIX regular expressions are meant to
be easier
for beginners, but they're less effective, and are likely not
to be
supported by default in PHP 6.
David Powers, Adobe Community Expert
Author, "Foundation PHP for Dreamweaver 8" (friends of ED)
Author, "PHP Solutions" (friends of ED)
http://foundationphp.com/

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