what does this mean? what string will be matched using the expression?
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I check the sizzle code and see such definition.

    var chunker = /((?:\((?:\([^()]+\)|[^()]+)+\)|\[(?:\[[^\[\]]*\]|['"][^'"]*['"]|[^\[\]'"]+)+\]|\\.|[^ >+~,(\[\\]+)+|[>+~])(\s*,\s*)?((?:.|\r|\n)*)/g,

I want to know what string this regular expression(am I right?) will match?