in js/libs/purl-2.3.1/purl.js [160:170]
function lastBraceInKey(str) {
var len = str.length,
brace,
c;
for (var i = 0; i < len; ++i) {
c = str[i];
if (']' == c) brace = false;
if ('[' == c) brace = true;
if ('=' == c && !brace) return i;
}
}