function _fnFilter( settings, input, force, regex, smart, caseInsensitive )
	{
		var rpSearch = _fnFilterCreateSearch( input, regex, smart, caseInsensitive );
		var prevSearch = settings.oPreviousSearch.sSearch;
		var displayMaster = settings.aiDisplayMaster;
		var display, invalidated, i;
		var filtered = [];
	
		// Need to take account of custom filtering functions - always filter
		if ( DataTable.ext.search.length !== 0 ) {
			force = true;
		}
	
		// Check if any of the rows were invalidated
		invalidated = _fnFilterData( settings );
	
		// If the input is blank - we just want the full data set
		if ( input.length <= 0 ) {
			settings.aiDisplay = displayMaster.slice();
		}
		else {
			// New search - start from the master array
			if ( invalidated ||
				 force ||
				 prevSearch.length > input.length ||
				 input.indexOf(prevSearch) !== 0 ||
				 settings.bSorted // On resort, the display master needs to be
				                  // re-filtered since indexes will have changed
			) {
				settings.aiDisplay = displayMaster.slice();
			}
	
			// Search the display array
			display = settings.aiDisplay;
	
			for ( i=0 ; i<display.length ; i++ ) {
				if ( rpSearch.test( settings.aoData[ display[i] ]._sFilterRow ) ) {
					filtered.push( display[i] );
				}
			}
	
			settings.aiDisplay = filtered;
		}
	}
Filter the data table based on user input and draw the table
 @param {object} settings dataTables settings object
 @param {string} input string to filter on
 @param {int} force optional - force a research of the master array (1) or not (undefined or 0)
 @param {bool} regex treat as a regular expression or not
 @param {bool} smart perform smart filtering or not
 @param {bool} caseInsensitive Do case insenstive matching or not
 @memberof DataTable#oApi