Question

I would like to replace only the group in parenthesis in this expression :

my_string.gsub(/<--MARKER_START-->(.)*<--MARKER_END-->/, 'replace_text') 

so that I get : <--MARKER_START-->replace_text<--MARKER_END-->

I know I could repeat the whole MARKER_START and MARKER_END blocks in the substitution expression but I thought there should be a more simple way to do this.

Answer 1

You could do something like this:

my_string.gsub(/(<--MARKER_START-->)(.*)(<--MARKER_END-->)/, '\1replace_text\3')