Ruby: Added missing regex interpolation

[RunDevelopment]

This fixes #2839.

[github-actions]

JS File Size Changes (gzipped)

A total of 1 files have changed, with a combined diff of +2 B (+0.2%).

file	master	pull	size diff	% diff
components/prism-ruby.min.js	1.02 KB	1.02 KB	+2 B	+0.2%

Generated by 🚫 dangerJS against f7cca6e

[sampatbadhe]

Thank You @RunDevelopment for fixing it quickly. PR looks good to me for interpolation fix.

I found below of scenarios while testing it on my local 👇

1 - When regex present with interpolation and in-line comment on same line it treats interpolation as comment for regex with /.../ works fine for %r[...].

2 - Regex Encoding options are supported, I can raise separate ticket for this.

Regular expressions are assumed to use the source encoding. This can be overridden with one of the following modifiers.
/pat/u - UTF-8
/pat/e - EUC-JP
/pat/s - Windows-31J
/pat/n - ASCII-8BIT

Can we fix Issue 1 in this PR? or should I raise separate issue for the same?

[RunDevelopment]

Thank you for the comment @sampatbadhe!

1. The real problem here is that the /.../ regexes aren't recognized as regexes at all. I'll fix it.
2. I looked through the doc you linked. There are actually a few other flags we don't support either. I opened Add missing Ruby regex flags #2844 for this.

[sampatbadhe]

@RunDevelopment recent changes looks good to me 👌