pattern = pattern
        // > Put a backslash ("\") in front of the first "!" for patterns that
        // >   begin with a literal "!", for example, `"\!important!.txt"`.
        .replace(REGEX_REPLACE_LEADING_EXCAPED_EXCLAMATION, '!')
        // > Put a backslash ("\") in front of the first hash for patterns that
        // >   begin with a hash.
        .replace(REGEX_REPLACE_LEADING_EXCAPED_HASH, '#')