Function isAudioLink

Picviewer CE+/Picviewer CE+.user.js:25887–25895

(url)

        }

        function isAudioLink(url) {
            if (url.indexOf('.audio') !== -1 || url.indexOf('audio:') === 0)
                return true;
            url = url.replace(/\/$/, "");
            if (url.lastIndexOf('?') > 0)
                url = url.substring(0, url.lastIndexOf('?'));
            const ext = url.substring(url.lastIndexOf('.') + 1).toLowerCase();
            return audioExtensions.has(ext);
        }

        MatchedRuleC.prototype={
            init:function(){