Extract specific text lines?

Question

I have a large several hudred thousand lines text file. I have to extract 30,000 specific lines that are all in the text file in random spots. This is the program I have to extr

Answer 1

Testing many conditions per line is generally slow when using a naive algorithm. There are various superior algorithms (e.g. using Tries) which can do much better. I suggest you give the Aho–Corasick string matching algorithm a shot. See here for a python implementation. It should be considerably faster than the naive approach of using a nested loop and testing every string individually.