Substitute only on certain lines

Question

Is there a way to have s;/;|;g run only on the lines I filter using a regex?

I have a file, which looks like:

Date: 2017/08/18
Path /home/share/thing
Path /home/me/thing
Date: 2017/08/18
Path /home/share/thing
Date: 2017/08/18
Path /home/share/thing
Path /home/me/thing
...

Now this is simplified, but the point is I want to substitute the / on the lines beginning with Path, but not the ones beginning with Date. I can grab all of the lines with Path easily enough (:g/Path) and substitute all of the /s (:%s;/;|;g), but for substituting on the specific lines I only know how to give s a range, which doesn't help much.

It seems like it would be easiest if you could pipe the output of g to s, but I couldn't find anything on doing something like that.

Answer 1

You can "pipe" the lines from :g/ to :s. Really, this is a special case of using any command after the g//.

g/Path/s;/;|;g

This is also documented explicitly at the bottom of the section :help :g