fixes a couple of regexps, the suite showed warnings about them
A couple of things worth mentioning here: - "{" is a metacharacter, should be escaped if it is meant to match a "{". The code worked, though, because the regexp engine is tolerant to this, but issued warnings. - gsub accepts a string as first argument. That's the best idiom to use when your pattern has no metacharacters, since gsub interprets the string as an exact substring to look for, rather than a regexp. The benefit is that your pattern is crystal clear and needs no backslashes.
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