Xreg extension - Regular Expression in two methods

I deliberately reduced the extension to two methods to propose to MIT their integration into the core of App Inventor in order to introduce the concept of regular expression to a large number of people.
The following package contains:
-extension: fr.danielm.Xreg.aix
-documentation and examples file: Regexp.html
-documentation and examples file: RegexpReplace.html

[fr.danielm.Xreg.zip - Google Drive]

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unlisting for now....