[Github-comments] [geany/geany] Document the regular expression replacement character (#2439)

[Matthew Brush]

It is documented in [the manual](https://www.geany.org/manual/current/index.html#regular-expressions):


\n | Where n is 1 through 9 refers to the first through ninth tagged region when searching or replacing. Searching for (Wiki)\1 matches WikiWiki. If the search string was Fred([1-9])XXX and the replace string was Sam\1YYY, when applied to Fred2XXX this would generate Sam2YYY.
-- | --

Maybe it needs to be called-out more, since the GLib docs don't do a good job either.


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