makeImportant() with regex

var colorChosen = false;var rainbowPickerJustChanged = false;const nsIFilePicker = Components.interfaces.nsIFilePicker;//Insert the snippet at the start of the code textbox or highlight it if it's already in therefunction insertCodeAtStart(snippet) {	var position = codeElement.value.indexOf(snippet);	if (position == -1) {		//insert the code		//put some line breaks in if there's already code there		if (codeElement.value.length > 0) {			codeElement.value = snippet + "\n" + codeElement.value;		} else {			codeElement.value = snippet + "\n";		}	}	//highlight it	codeElement.setSelectionRange(snippet.length + 1, snippet.length + 1);	codeElement.focus();}function insertCodeAtCaret(snippet) {	var selectionEnd = codeElement.selectionStart + snippet.length;	codeElement.value = codeElement.value.substring(0, codeElement.selectionStart) + snippet + codeElement.value.substring(codeElement.selectionEnd, codeElement.value.length);	codeElement.focus();	codeElement.setSelectionRange(selectionEnd, selectionEnd);}function insertChromePath() {	var ios = Components.classes["@mozilla.org/network/io-service;1"].getService(Components.interfaces.nsIIOService);	var fileHandler = ios.getProtocolHandler("file").QueryInterface(Components.interfaces.nsIFileProtocolHandler);	var chromePath = fileHandler.getURLSpecFromFile(Components.classes["@mozilla.org/file/directory_service;1"].getService(Components.interfaces.nsIProperties).get("UChrm", Components.interfaces.nsIFile));	insertCodeAtCaret(chromePath);}function chooseColor(event) {	colorChosen = true;	var parent = event.target.parentNode;	while (parent != null) {		switch (parent.nodeName) {			case "menupopup":				parent.hidePopup();				break;			case "button":				parent.open = false;		}		parent = parent.parentNode;	}	setTimeout(insertColor, 1);}function insertColor() {	if (colorChosen) {		insertCodeAtCaret(document.getElementById("normal-colorpicker").color);		colorChosen = false;	}}function insertRainbowPickerColor(event) {	//rainbowpicker does it twice...	if (rainbowPickerJustChanged) {		return;	}	rainbowPickerJustChanged = true;	setTimeout(function() {rainbowPickerJustChanged = false}, 100);	insertCodeAtCaret(event.target.color);}function openSitesDialog() {	openDialog("chrome://stylish/content/specifySites.xul", "stylishSpecifySites", "chrome,modal,resizable,centerscreen", this.applySpecifySite);}function changeWordWrap(on) {	var prefs = Components.classes["@mozilla.org/preferences-service;1"].getService(Components.interfaces.nsIPrefService);	prefs = prefs.getBranch("extensions.stylish.");	prefs.setBoolPref("wrap_lines", on);	refreshWordWrap(on);}function refreshWordWrap(on) {	//bug 41464 (wrap doesn't work dynamically) workaround	codeElement.style.display = "none";	codeElement.setAttribute("wrap", on ? "on" : "off");	setTimeout("document.getElementById('code').style.display = '';", 10);}function insertDataURI() {	var fp = Components.classes["@mozilla.org/filepicker;1"].createInstance(nsIFilePicker);	fp.init(window, STRINGS.getString("dataURIDialogTitle"), nsIFilePicker.modeOpen);	if (fp.show() != nsIFilePicker.returnOK) {		return;	}	var file = fp.file;	var contentType = Components.classes["@mozilla.org/mime;1"].getService(Components.interfaces.nsIMIMEService).getTypeFromFile(file);	var inputStream = Components.classes["@mozilla.org/network/file-input-stream;1"].createInstance(Components.interfaces.nsIFileInputStream);	inputStream.init(file, 0x01, 0600, 0);	var stream = Components.classes["@mozilla.org/binaryinputstream;1"].createInstance(Components.interfaces.nsIBinaryInputStream);	stream.setInputStream(inputStream);	var encoded = btoa(stream.readBytes(stream.available()));	stream.close();	inputStream.close();	insertCodeAtCaret("data:" + contentType + ";base64," + encoded);}function makeImportant() {	//preserve scroll position	var box = codeElement.mInputField;	var scroll = [box.scrollTop, box.scrollLeft];	var code = codeElement.value;	//first change ;base64 to __base64__ so we don't match it on the ;	code = code.replace(/;base64/g, "__base64__");	// first remove all '!important' to avoid errors	code = code.replace(/\s*!\s*important\s*/g, '');	// then add '!important' where appropriate	code = code.replace(/([A-Za-z0-9]+\s*):(\s*[^\/]+?)(\s*[;}])/g, "$1:$2 !important$3");	//put ;base64 back	code = code.replace(/__base64__/g, ";base64");	codeElement.value = code;	//restore scroll position	box.scrollTop = scroll[0];	box.scrollLeft = scroll[1];}