Joost

Ever annoyed when you had to add that same opening sentence or image to a blogpost for the gazzilionth time? Or always wanted to have an easy way to insert youtube video’s to your site? 
Despair no more, now there is searchReplace. Well, there probably are a number of similar plugins, but this one is different: it is mine. 🙂
The plugin makes it possible to search for certain texts and replace them, in both comments and posts. It does not alter your database contents. 
For example, you could add the string “[topicimage]” to searchReplace and replace that with your default image tag. 
When changing your default image you only have to change the searchReplace item to change it site wide!
The plugin supports regular expressions as well, which makes it possible to do url replacements, or other more advanced search and replace commands.
Uses: Implementing BBcode (pre configured), replace foul language, easy YouTube insertion (pre configured) etc.
It has the following features:
<ul>
<li>Easily add, edit and delete rules</li>
<li>simple search and replace option</li>
<li>regular expression search and replace option</li>
<li>apply rules to comments, posts or both at once</li>
<li>Pre installed with BBcode (minus smilies and tables) http://en.wikipedia.org/wiki/BBCode</li>
</ul>

searchReplace

SearchReplace checks for and replaces content in your posts, pages and/or comments. Fully configurable.

Lars.D.Rasmussen

rexCrawler uses regular expressions to crawl specified websites. 
Websites are saved in user-defined groups, which can then be showed on wordpress pages/posts using shortcodes. 
The data crawled by rexCrawler is saved in the WP database in custom tables. Once data has been crawled, it can be inserted 
into a page using the shortcode [rexCrawler]. Refer to the documentation on <a href="http://www.rexcrawler.com" rel="nofollow ugc">http://www.rexcrawler.com</a> for more information on how to use rexCrawler.

rexCrawler

rexCrawler is a regular expression web-crawler plugin. Able to parse websites, save data and show them on pages.

searchReplace vs rexCrawler