How to escape wildcard chars - and find the offset of a '?' in a URL?

[BT]

Hi folks,
What’s the correct the syntax needed to escape a question mark so that its offset can be found in a URL string?

I get zero returned by put offset(“?”, tURL) and put offset( "?\",tURL) and put offset( numToCodepoint(Ux003F),tURL) throws errors.

The docs & forums cover escaping quotes but not wildcard characters.

Thanks in advance for any steer.
Best,
Keith