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<?php
if(isset($_GET['submit'])) {
if(preg_match("/^\(([2-9][0-9]{2})\)[2-9][0-9]{2}-[0-9]{4}$/i",
$_GET['phone']) != 1) {
echo "The phone field was invalid<BR>";
}
} else {
/* Code to process form here */
}
?>
<HTML>
<HEAD><TITLE>Elementary form validation</TITLE></HEAD>
<BODY>
<FORM ACTION="<?php echo $_SERVER['PHP_SELF']; ?>" METHOD=GET>
<INPUT TYPE="hidden" NAME="submit" VALUE="1">
Phone: <INPUT TYPE="text" NAME="phone" SIZE=13 MAXLENGTH=13>
(ex. (333)555-1212)<BR>
<INPUT TYPE="submit" VALUE="Send">
</FORM>
</HTML>
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