Page 604 - Beginning PHP 5.3

Part III: Using PHP in Practice
((-|\.)[A-Za-z\d]+)* # followed 0 or more times by (- or . and more
# alphanums)
\.[A-Za-z\d]+ # followed by a final dot and some alphanumerics

$ # End of string
/x”;

$phoneNumberPattern = “/
^ # Start of string

( # Optional area code followed by optional
# separator:
\(\d{3}\)[-. ]? # Code with parentheses
| # or
\d{3}[-. ]? # Code without parentheses
)?

\d{3} # Prefix
[-.] # Hyphen or dot separator
\d{4} # Line number

$ # End of string
/x”;

$productCodePattern = “/^(SW|MW|WW)(\d{2})$/i”;

if ( !preg_match( $emailAddressPattern, $_POST[“emailAddress”] ) )
$errorMessages[] = “Invalid email address”;
if ( !preg_match( $phoneNumberPattern, $_POST[“phoneNumber”] ) )
$errorMessages[] = “Invalid phone number”;

if ( $errorMessages ) {
echo “<p>There was a problem with the form you sent:</p><ul>”;
foreach ( $errorMessages as $errorMessage ) echo “<li>$errorMessage
</li>”;
echo ‘<p>Please <a href=”javascript:history.go(-1)”>go back</a> and try
again.</p>’;
} else {
echo “<p>Thanks for your order! You ordered the following items:</
p><ul>”;
$productCodes = preg_split( “/\W+/”, $_POST[“productCodes”], -1, PREG_
SPLIT_NO_EMPTY );
$products = preg_replace_callback( $productCodePattern,
“expandProductCodes”, $productCodes );
foreach ( $products as $product ) echo “<li>$product</li>”;
echo “</ul>”;
}

}

function expandProductCodes( $matches ) {

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