jQuery :containsExact() selector

jquery.containsExact.js

/**
 * All credit goes to http://wowmotty.blogspot.com/2010/05/jquery-selectors-adding-contains-exact.html
 */

$.extend( $.expr[":"], {
  containsExact: $.expr.createPseudo ?
    $.expr.createPseudo(function(text) {
      return function(elem) {
        return $.trim(elem.innerHTML.toLowerCase()) === text.toLowerCase();
      };
    }) :
    // support: jQuery <1.8
    function(elem, i, match) {
      return $.trim(elem.innerHTML.toLowerCase()) === match[3].toLowerCase();
    },
  
  containsExactCase: $.expr.createPseudo ?
    $.expr.createPseudo(function(text) {
      return function(elem) {
        return $.trim(elem.innerHTML) === text;
      };
    }) :
    // support: jQuery <1.8
    function(elem, i, match) {
      return $.trim(elem.innerHTML) === match[3];
    },
  
  containsRegex: $.expr.createPseudo ?
    $.expr.createPseudo(function(text) {
      var reg = /^\/((?:\\\/|[^\/]) )\/([mig]{0,3})$/.exec(text);
      return function(elem) {
        return RegExp(reg[1], reg[2]).test($.trim(elem.innerHTML));
      };
    }) :
    // support: jQuery <1.8
    function(elem, i, match) {
      var reg = /^\/((?:\\\/|[^\/]) )\/([mig]{0,3})$/.exec(match[3]);
      return RegExp(reg[1], reg[2]).test($.trim(elem.innerHTML));
    }
  
});