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Filtrar dados de uma tabela

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table.filter = function(o,filters,args) {
	var cell;
	args = args || {};

	var t = this.resolve(o,args);
	var tdata = this.tabledata[t.id];

	// If new filters were passed in, apply them to the table's list of filters
	if (!filters) {
		// If a null or blank value was sent in for 'filters' then that means reset the table to no filters
		tdata.filters = null;
	else {
		// Allow for passing a select list in as the filter, since this is common design
		if (filters.nodeName=="SELECT" && filters.type=="select-one" && filters.selectedIndex>-1) {
			filters={ 'filter':filters.options[filters.selectedIndex].value };
		// Also allow for a regular input
		if (filters.nodeName=="INPUT" && filters.type=="text") {
			filters={ 'filter':"/^"+filters.value+"/" };
		// Force filters to be an array
		if (typeof(filters)=="object" && !filters.length) {
			filters = [filters];

		// Convert regular expression strings to RegExp objects and function strings to function objects
		for (var i=0,L=filters.length; i<L; i++) {
			var filter = filters[i];
			if (typeof(filter.filter)=="string") {
				// If a filter string is like "/expr/" then turn it into a Regex
				if (filter.filter.match(/^\/(.*)\/$/)) {	

					filter.filter = new RegExp(RegExp.$1);
				// If filter string is like "function (x) { ... }" then turn it into a function
				else if (filter.filter.match(/^function\s*\(([^\)]*)\)\s*\{(.*)}\s*$/)) {
					filter.filter = Function(RegExp.$1,RegExp.$2);
			// If some non-table object was passed in rather than a 'col' value, resolve it 
			// and assign it's column index to the filter if it doesn't have one. This way, 
			// passing in a cell reference or a select object etc instead of a table object 
			// will automatically set the correct column to filter.
			if (filter && !def(filter.col) && (cell=getParent(o,"TD","TH"))) {
				filter.col = this.getCellIndex(cell);

			// Apply the passed-in filters to the existing list of filters for the table, removing those that have a filter of null or ""
			if ((!filter || !filter.filter) && tdata.filters) {
				delete tdata.filters[filter.col];
			else {
				tdata.filters = tdata.filters || {};
				tdata.filters[filter.col] = filter.filter;
		// If no more filters are left, then make sure to empty out the filters object
		for (var j in tdata.filters) { var keep = true; }
		if (!keep) {
			tdata.filters = null;
	// Everything's been setup, so now scrape the table rows
	return table.scrape(o);

A questão é que tenho este código, contudo a filtragem que ele faz é case sensitive. Já tentei perceber e tentar compor para que o transforme em case INsensitive mas não estou com grande sorte.

Será que algum entendido na matéria me poderia dar um apoiozinho nisto?

Obrigado desde já  :)

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