I'm constantly amused by how often regular expression syntax can be found in all sorts of unexpected places. It really is foundational knowledge these days.
^ means match input start
$ means match input end
Makes remembering the CSS selector syntax easier once you know that. (Or makes the regex syntax easier to remember?)
and
[title$=“old”]
Once you get used to using these, and their relatives, you find all kinds of uses for them, like applying styles only to telephone links: