I just completed "Monster Messages" - Day 19: Part 1 was pretty straightforward but Part 2 took me some time, and also [part 2 spoiler, continued in reply] adventofcode.com/2020/day/19

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AoC day 19 part 2 spoiler 

my solution seems to be hitting some limitation in PHP's regex implementation but since I only need the number of matches I just pasted it in regex101.com and got the number from there lol

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