Regex Renamer is a tool to mass rename files given a regular expression. It is an extensible tool to rename files of a folder based on a regular expression to match patterns and replace with vales the user define. The values varies from constant expressions and a wide range of variable expressions like sequencers, file information, mp3 tags, and much more. It's also possible to create custom expressions and integrate them with Regex Renamer with the plug-in APIs.