catch single line comments in SQL language

[solugebefola]

This is to catch single line comments in the SQL language when the code text is a multiline string

[isagalaev]

Do you have a test that shows it not working before your fix and working after? I'm asking because $ already means the end of line, and it works throughout pretty much all the languages in highlight.js.

[solugebefola]

I realized that the issue was with the use of a hashmark in my text prompts which is picked up by the sql language as illegal. I was hacking a solution by splitting the code into separate lines, and it was working then, which is why I thought that the issue was with single line vs. multiline. I am withdrawing the PR.
Maybe there needs to be a 'psql' language to allow putting prompts with hashmarks in the code?

Anyway, sorry to take up your time with this. Thanks for responding so fast.

[isagalaev]

There can be two different approaches to handling repl prompts. One is adding a mode that is then inserted everywhere, like in Python: https://github.com/isagalaev/highlight.js/blob/master/src/languages/python.js#L7-L9. Another is a helper language that embeds the parent language, like in Clojure: https://github.com/isagalaev/highlight.js/blob/master/src/languages/clojure-repl.js