I suspect that this is an NP-hard problem. Would you prefer a greedy solution, or a computationally infeasible one?

Regex can do many things, but unbaking a cake isn't one of them.

It's a grammar that makes heavy use of regular expressions. So make sure you brush up your skill on backward/forward references and lookarounds, because all these can be used.

If you've ever talked about regular expressions with another programmer, you've invariably heard this 1997 chestnut: Some people, when confronted with a problem, think "I know, I'll use regular expressions." Now they have two problems.

One does not have to escape ] outside of the character class.

In regular expressions a dot . means "any character", the plus + means "one or more times", and the question mark ? after this means "try to match this as few as possible times" - which is useful so it won't keep matching past your quote marks

SQL regular expressions are a curious cross between LIKE notation and common (POSIX) regular expression notation.

Tables are not yet supported. If you love impossible to read regular expressions, submit a PR!

old_log_entries = old_log.split /(?=commit [0-9a-f]{40})/ # Lookahead assertions FTW

old_log.split /(?=commit [0-9a-f]{40})/ # Lookahead assertions FTW

Visualization by Debuggex

I'm using a negative lookahead to mean "ignore all in /node_modules/ unless it's that package" using