escapeSelector.js

escapeSelector.js

// https://code.jquery.com/jquery-3.3.1.js
var escapeSelector = function(sel) { // $.escapeSelector()
    var rcssescape = /([\0-\x1f\x7f]|^-?\d)|^-$|[^\0-\x1f\x7f-\uFFFF\w-]/g;
    var fcssescape = function(ch, asCodePoint) {
        if (asCodePoint) {
            // U+0000 NULL becomes U+FFFD REPLACEMENT CHARACTER
            if (ch === "\0") {
                return "\uFFFD";
            }
            // Control characters and (dependent upon position) numbers get escaped as code points
            return ch.slice(0, -1) + "\\" + ch.charCodeAt(ch.length - 1).toString(16) + " ";
        }
        // Other potentially-special ASCII characters get backslash-escaped
        return "\\" + ch;
    };

    return (sel + '').replace(rcssescape, fcssescape);
};