Way to do RegEx substring replacements?

[Jim Witte]

Is there a way in Revolution (2.0.3) to do a RegEx find and replace  
using one of the sub-expressions, like finding

(....) ([^x]*)x.*

and replacing by

\1\t\2

directly without having to use matchText to extract the  
subexpressions and then construct the line? (Yes, I know this should  
be in Perl, Python, or something else - that's next after the  
prototype is done)

Jim