JS: Userscript that adds a persistent REGEX filter field to craigslist search pages.

clist-filter.user.js

// ==UserScript==
// @name        CList Filter
// @version     0.2
// @namespace   giggleboxstudios
// @include     *.craigslist.org/search/*
// @grant       none
// ==/UserScript==

/*jshint strict:true, evil:true, boss:false, laxcomma:true, laxbreak:true, latedef:true, immed:true, newcap:true, noarg:true, nonew:true, plusplus:true, regexp:true, undef:true, unused:true, trailing:true, eqeqeq:true, curly:true, camelcase:true, bitwise:true */


// ============================== DO NOT EDIT BELOW HERE ==============================
var widgetName        = 'clist-filter'
  , $cookieName       = widgetName
  , $searchContainer  = '#hoodpicker'
  , $regexField       = '#clist-regex'
  , $searchForm       = '#searchform'
  , $listings         = $('.row')

  , match = {
      filter:         ''
    , currentPage:    /[\w\d:\/\.]+\/([\w]{1,})[\w\d\:\/\.\?\=-_+]+/gi
    }

  , temp              = ''
  , tempRegex         = ''
  ;

(function($) {

  "use strict";

  // Load jQuery (if needed) and load our widget script from the server
  if (window.top !== window.self) { return; }

  // Regex field contents to be appended to $searchContainer
  temp  =   '<span style="display: inline-block; padding: 0 10px 0 30px;">regex filter:</span>'
        +   '<input id="clist-regex" name="clist-regex" class="pants dv" value="" placeholder="regex filter">'
        ;

  // Cache search form
  $searchForm       = $($searchForm);

  // Cache clist search container
  $searchContainer  = $($searchContainer).parent().append(temp);

  // Cache regex input field
  $regexField       = $($regexField);
  tempRegex         = $regexField.val();

  // Check if our cookie is available
  if ($.cookie($cookieName) !== '') {
    tempRegex = $.cookie($cookieName);
    $regexField.attr('value', tempRegex);
    match.filter = new RegExp(tempRegex, 'gi');
  }

  // Function that updates regex field
  function updateRegex() {

    // Assign the value to our regex cookie
    if (tempRegex !== $regexField.val()) {
      $regexField.attr('value', $regexField.val());
      $.cookie($cookieName, $regexField.val());
    }

    return false;
  }

  // When we leave the regex field
  $regexField.on('blur', function() {
    updateRegex();
  });

  $searchForm.on('submit', function() {
    updateRegex();
  });

  // Run the regex
  $listings.each(function() {
    var $this     = $(this)
      , name      = $this.find('.pl > a').text()
      , location  = $this.find('.pnr > small').text()
      ;

    if (!name.match(match.filter) && !location.match(match.filter)) {
      $this.remove();
    }
  });

})(jQuery);

TODO:

• Add jQuery test and dependency loading provided jQuery and jQuery.cookie() are not available for whatever reason.
• Change filter logic to target location text as well.
• Add check to determine which search context we're on and store regex cookie for that search context.
  • /search/sss? vs /search/aba?

---

Other features are welcome, so please suggest :)