The new snippet plugin is really powerful, after reading instructions in the help file, I guess it can do many productive things beyond my imagination.

What I want to do is making an expandable comment banner like below, I guess it can be done with regular expression to transform text in a placeholder, but I'm an absolute beginner in writing regular expression...


After a little bit of quick-start lesson, I wrote a short regex, aimed for replacing all characters in a string into "=", which works fine in an online regex tester.


But when I put my regex into a snippets, it behaves totally different, would somebody give me a hand?