You could have downloaded yooMatch 1.0 for Mac from our software library for free. The program is included in Theming Tools.
From the developer:
yooMatch adds powerful new text searching and manipulation features to FileMaker. Perl compatible regular expressions help you easily find what was almost impossible to find before. With yooMatch you can find text, extract data, parse complex formatting like XML and HTML, and perform sophisticated substitutions.
You may want to check out more software for Mac, such as Occurrence Selector, which might be related to yooMatch.