Javascript Regular Expression multiple match

You can use a regex to do this.

var qualityRegex = /(?:^|[&;])quality=([^&;]+)/g,
    matches,
    qualities = [];

while (matches = qualityRegex.exec(window.location.search)) {
    qualities.push(decodeURIComponent(matches[1]));   
}

jsFiddle.

The qualities will be in qualities.