Problem with picking up regex symbols

Hi,
Firstly, thanks a lot for this useful module.
I had problem with replacing text that had "$" in it until I changed it to "\$", although "Use regular expressions in search" checkbox was unchecked.
I suggest to have a contextual help paragraph to the right of the field explaining which symbols need to be escaped with "\" and how to submit exact plain strings without module trying to see regex in it.

Thank you!

// The special characters to escape if a search string is not a regex string.
define('SCANNER_REGEX_CHARS', '.\/+*?[^]$() {}=!<>|:');