"relative" marks?

Is there a way to set a mark (or similar) that is relative to a word?
For instance, given the following text:

Foo bar. Baz.
And more stuff.

I'd like to be able to quickly jump to the space after "bar." even if
the text has been changed to something like:

Additional text. Foo bar. Baz.
And more stuff.

c
--
Chris Lott <chris@chrislott.org>

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