src/selector/escapeSelector.js


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import { jQuery } from "../core.js";

// CSS string/identifier serialization
// https://drafts.csswg.org/cssom/#common-serializing-idioms
var rcssescape = /([\0-\x1f\x7f]|^-?\d)|^-$|[^\x80-\uFFFF\w-]/g;

function fcssescape( 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;
}

jQuery.escapeSelector = function( sel ) {
	return ( sel + "" ).replace( rcssescape, fcssescape );
};