I have a block which contains filenames. I would like to get a true or false value 
back indicating whether or not there is a filename in the block that terminates with a 
r~ extension.

Please show me how to do this.

>> a
== [%cast.r %feedback.r %ftp.r %ftp.r~ %instinet.r %instinet.r~ %lconfig.r %lconfig.r~ 
%nntp.r %notes.html %rebdoc.r
%rebol.exe %re...

Could someone show me how to glob for feedback.r?

In other words, I want to say


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