Downloading ReX-T 4.2 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. ReX-T for Mac is categorized as Developer Tools. This software for Mac OS X is a product of Esclepius Software LLC. We recommend checking the downloaded files with any free antivirus.
From the developer:
ReX-T allows you to easily develop complex regular expression patterns and test them. It lets you produce ready-to-use Swift or Objective-C code so you can use it for your own applications. Executing the pattern on any source text will give you a comprehensive overview of the matches, their positions, and lengths. You can save your completed pattern in the Pattern Library for later use.
You may want to check out more software for Mac, such as Url Extractor X, JustinmindPrototyper or HtmlTidy, which might be related to ReX-T.
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