Regex to detect JavaScript Regex

Question

I'm trying to write a regex that would detect regex in a javascript file. I've spent some time and this is what I've come up with:

\/.*?\/[a-zA-Z]?

This works fine:

/^[^0-9][2,3]$/
/^[a-z]+( +[a-z]+){2,}$/g

However it fails for something like this:

/\/.*?\/[a-zA-Z]?/g

Just to clarify my goal, I'm going to be using this regex to detect regexes in JavaScript code and color code them.

Answer 1

You should also check whether the / is preceeded by a \ or not to make sure it is not being escaped:

(?<!\\)\/.*?(?<!\\)\/[a-zA-Z]?

DEMO