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Apps with 'Regex substitution' feature
Vim ("Vi IMproved") is an advanced text editor that allows syntax highlighting, word completion and has a huge amount of contributed content. It also has a GUI version called GVim. Regular expressions are a powerful tool for developers, but they aren't the easiest things to build and debug. Multi String Replacer is a small and portable application that can be used to replace multiple strings at once. sed (stream editor) is a Unix utility that parses text and implements a programming language which can apply transformations to such text.