PAC File interpretation of shExpMatch return wrong results

[JGRSAGA]

We are running into issues with PAC Files that uses the shExpMatch Function and uses the Brackets '(' as the first character in the expression.
If we use "shExpMatch(host,"(.example.com|example.com)") the result of a test against "my host.example.com" as the host will return "false" even if all other PAC-File checkers are return true.
The reason is, that the expression resulting from the shExpMatch Function will use the first '(' as a Literal and escape this with (.
The result will then be ^(..example.com|example.com)$

As a quick workaround I tested
// If Expression starts with '(', remove leading and trailing Brackets

    if (shExp[0] === "(") {
        shExp = shExp.substring(1,shExp.length-1);
    }

which seems to work as expected.