You're giving this error:
warning: preg_match (): No ending delimiter '^' found in /home/j17oloba/public_html/libs/lib.php on line 536
function lib_checkemail($email)
{
if(preg_match("^[0-9a-z]([-_.]?[0-9a-z])*@[0-9a-z]([-.]?[0-9a-z])*\.[a-z]{2,3}$", $email, $check))
{
It is necessary to place delimiters in the regular expression, thus:
if(preg_match("/^[0-9a-z]([-_.]?[0-9a-z])*@[0-9a-z]([-.]?[0-9a-z])*\.[a-z]{2,3}$/", $email, $check))
A delimiter can be any non-alphanumeric character that is neither an inverted slash \ nor a space. Examples: / , # , ~ , % .
More information: Delimiters
You need to add delimiters in your regular expression.
Example using # at start and end:
"#^[0-9a-z]([-_.]?[0-9a-z])*@[0-9a-z]([-.]?[0-9a-z])*\.[a-z]{2,3}$#"