On Sat, Sep 15, 2018 at 06:45:33PM -0700, ToddAndMargo wrote: : Hi All, : : I have been doing a bunch with regex's lately. : I just throw them out based on prior experience : and they most all work now. I only sometimes have to : ask for help. (The look forward () feature : is sweet.) : : Anyway, I have been using regex switches without : knowing why. So : : What is the difference between : : \N
That is a character that is not any of the valid \n characters. : :\N That is not a thing. That is a colon, which causes the previous thing to not backtrack (if it would), followed by a \N (see above). : <:\N> That is not a thing. In fact, it's a syntax error. : <<\:N>> That also is not a thing. That is a left word boundary <<, followed by \:, which matches a quote literally because it's backslashed, followed by an N, which also matches literally, followed by the right word boundary >>. As a pattern, it is impossible for the combination to match, since, while >> can match after a literal N, a << cannot match before a colon. : And why would I choose one over the other (what : are they called out for)? I would never choose any of them, apart from \N. Where are you getting this craptastic list from? Larry
