barfing-map.js

function (doc) {
   // DOESN'T WORK:
   var version = /(\d+)\.?(\d+)?\.?(\d+)?/.exec("1.3");
   emit(version);
}

error

[info] [<0.6354.4>] OS Process #Port<0.3446> Log :: function raised exception (new TypeError("/(\\d+)\\.?(\\d+)?\\.?(\\d+)?/.exec is not a function", "", 2)) with doc._id bf7b2575897460c9a5543a1f153089c8

working-map.js

function (doc) {
   // WORKS:
   var version = ("1.3").match(/(\d+)\.?(\d+)?\.?(\d+)?/);
   emit(version);

   var version = new RegExp(/(\d+)\.?(\d+)?\.?(\d+)?/).exec("1.3");
   emit(version);
}