Your regex can be put into the capturing parentheses that can be wrapped with a positive lookahead. To make it work on Mac, too, make sure the regex matches (and thus consumes) a single char at each match by placing a . (or – to also match line break chars – [\s\S]) after the lookahead. … Read more
A set which forms a matroid (https://en.wikipedia.org/wiki/Matroid) can be used to solve the coin changing problem by using greedy approach. In brief, a matroid is an ordered pair M = (S,l) satisfying the following conditions: S is a finite nonempty set l is a nonempty family of subsets of S, called the independent subsets,such that … Read more
Recall that in Dijkstra’s algorithm, once a vertex is marked as “closed” (and out of the open set) – the algorithm found the shortest path to it, and will never have to develop this node again – it assumes the path developed to this path is the shortest. But with negative weights – it might … Read more
Neither basic nor extended Posix/GNU regex recognizes the non-greedy quantifier; you need a later regex. Fortunately, Perl regex for this context is pretty easy to get: perl -pe ‘s|(http://.*?/).*|\1|’