you don't need such package, method, or function (regex operation)

Why so? Regular expressions are pretty fast. It completes the tests in just over 2s. Your solution takes 1.7s.

In fact, if you pre-compile the regex, this solution runs just as fast as the one you made.

This is a very inefficient solution. It requires an extra package, and does a lot of unnecesary string processing.

The test case is fine. I see you have solved it already. So it means you have figured it out. It's not the series of bombs. All of them explode at the same time.

Thanks for solving my kata!

Check the case "#n[e]###x[h]xrv[p]x#sz[sec]ha[ohr]cbgm[a]". Is it the serie of bombs 2-3-4 would destroy the chain "x[h]xrv[" that makes the p vulnerable against the 5th bomb?
The test case expected "psecohra" but the correct result should be "secohra".