whole_func_string: function(property, value, anyMatch, caseSensitive) {
          var filters = [];
  
          //support for the simple case of filtering by property/value
          if (Ext.isString(property)) {
              filters.push(new Ext.util.Filter({
                  property     : property,
                  value        : value,
                  anyMatch     : anyMatch,
                  caseSensitive: caseSensitive
              }));
          } else if (Ext.isArray(property) || property instanceof Ext.util.Filter) {
              filters = filters.concat(property);
          }
  
          // At this point we have an array of zero or more Ext.util.Filter objects to filter with,
          // so here we construct a function that combines these filters by ANDing them together
          // and filter by that.
          return this.filterBy(Ext.util.Filter.createFilterFn(filters));
      }
func_code_string: function(property, value, anyMatch, caseSensitive) {
          var filters = [];
  
          //support for the simple case of filtering by property/value
          if (Ext.isString(property)) {
              filters.push(new Ext.util.Filter({
                  property     : property,
                  value        : value,
                  anyMatch     : anyMatch,
                  caseSensitive: caseSensitive
              }));
          } else if (Ext.isArray(property) || property instanceof Ext.util.Filter) {
              filters = filters.concat(property);
          }
  
          // At this point we have an array of zero or more Ext.util.Filter objects to filter with,
          // so here we construct a function that combines these filters by ANDing them together
          // and filter by that.
          return this.filterBy(Ext.util.Filter.createFilterFn(filters));
      }
func_documentation_string: <p>Filters the objects in this collection by a set of {@link Ext.util.Filter Filter}s, or by a single
  property/value pair with optional parameters for substring matching and case sensitivity. See
  {@link Ext.util.Filter Filter} for an example of using Filter objects (preferred). Alternatively,
  MixedCollection can be easily filtered by property like this:</p>
  
  //create a simple store with a few people defined
  var people = new Ext.util.MixedCollection();
  people.addAll([
  {id: 1, age: 25, name: 'Ed'},
  {id: 2, age: 24, name: 'Tommy'},
  {id: 3, age: 24, name: 'Arne'},
  {id: 4, age: 26, name: 'Aaron'}
  ]);
  
  //a new MixedCollection containing only the items where age == 24
  var middleAged = people.filter('age', 24);
  
  @param {Ext.util.Filter[]/String} property A property on your objects, or an array of {@link Ext.util.Filter Filter} objects
  @param {String/RegExp} value Either string that the property values
  should start with or a RegExp to test against the property
  @param {Boolean} [anyMatch=false] True to match any part of the string, not just the beginning
  @param {Boolean} [caseSensitive=false] True for case sensitive comparison.
  @return {Ext.util.MixedCollection} The new filtered collection
  @since Ext 1