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Oh, that's a thing called regular expression, 06/11/2013, 12:44:53 |
shortly 'regex'. It's good for determining whether a string of characters is in certain form (which is defined by regex). Here [NWSE] means 'any of characters N, W, S, E', {5} means 'exactly five times'.
(Sorry for it; as a programmer, I just sometimes use ... say, inappropriate means of expressing myself.) (I don't remember how exactly the answer runs, but it's in my book of MMIII notes. But I think it is (HL)NWNES(stop HL).) |
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