this comes close to what I want, but I am not sure if it can fulfill my needs:

in a text file with many lines that some of those have the same starting characters followed by a tab, I want to group those lines together

if there is only one line with a specific sequence of starting characters followed by a tab, then this is a group itself

is it possible?

the identification that EmEditor will seek in order to group the proper lines, is a multidigit number, followed by a tab

any idea?

thanks!