Tenger Plugin: regular expression
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Search Regex
Search Regex adds a powerful set of search and replace functions to WordPress posts, pages, custom post types, and other data.
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searchReplace
SearchReplace checks for and replaces content in your posts, pages and/or comments. Fully configurable.
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rexCrawler
rexCrawler is a regular expression web-crawler plugin. Able to parse websites, save data and show them on pages.