Ruby - Interpolate text quickly in regex

We know this:

p '%s' % "test"
#=> "test"

But is it possible to do this:

s = "string"
s[/#{%s}/] % "test"


Well, you could always just do this:

s["%s" % "test")]

If your string can contain characters with special meaning, use Regexp.escape beforehand. Also, you can directly interpolate into a regular expression:

s = "test"
/#{s}/ #=> /test/

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