JS RegExp Bug in CS5

Question

var text = "aXbY";
var re = /^(.*?)(?:X(.+)Y)?$/;
alert(text.match(re));
Returns "aXbY,,b" in Photoshop instead of "aXbY,a,b".
The non-capturing parentheses seems to be the problem.

Answer 1

This:
var reg = RegExp("^(\+|\-)?(\d|\.\d|\d\.\d)$");
should be this:
var reg = RegExp("^(\\+|\\-)?(\\d|\\.\\d|\\d\\.\\d)$");
if what you want is really this:
var reg = /^(\+|\-)?(\d|\.\d|d\.\d)$/;
The mappings between String literals and RegExp literals can be dicey, especially if the strings are getting constructed at runtime. The syntax error in the first case are probably from the + and - not being fully escaped when parsed by the RegExp constructor.
-X