The text finder is having some issues with special characters. It cannot for example find special characters by themselves, words starting with special characters and some special characters will still work. See below for some examples:

Here ::load() is not found in the text. (It starts with a special character)

While load() is found without any issue. (it finishes with special character)

A single opening parenthesis is not found.

A single closing parenthesis is found.

But both together () are not found.