Pattern displays with extra set of //s

[drewish]

We've got some patterns used to indicate the restrictions on fields, e.g.

          pattern: "/^[a-z0-9_+-]+$/i"

They're rendering with an extra set of slashes around them:

I wasn't sure if we should just rewrite the expression to avoid the need for the case insensitive flag or open a bug here. Looking at the Open API 3 docs they don't have much detail on the expected format. The only detail it had was:

• pattern (This string SHOULD be a valid regular expression, according to the ECMA 262 regular expression dialect)

Looking at that it seems like the /s are considered part of the regex and it'd actually be a bug not to have them... but I can see how including them makes it more apparent it's a regex. It seems to me that redoc should either not append the slashes, or only add slashes if they are not already part of the regex.