How reverse regex in html pattern?

This pattern is for check if this input form has ONLY special character, but i need to reverse it, so return true if the input form HAS NOT ONLY special character

<input type="text" pattern="[^a-zA-Z0-9]+">

EXAMPLE:
"Hello" is okay,
"Hello/;:" is okay,
";:.&" is NOT okay, cause it has ONLY special character

>Solution :

The pattern you’re after is .*[a-zA-Z0-9].*.

As a general rule, to check if a strings contains a match to a pattern, surround the pattern with .* on both sides.