[Pharo-users] What are RBPattern* classes in the AST?

[Steven Costiou]

Hi, 

i was browsing the classes of the AST and i am curious about the
RBPattern* classes. 

What are they used for? 

The RBPatternParser's comment says that it is used "to search and
transform source code". 

After looking a bit in the senders and class refs, it seems it is used
for refactorings and other stuff. 

But is that used at some point in code compilation? 

Steven.