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  • Re your last sentence: or, just read the documentation for the tool/language you are using, and find out exactly which characters mean what. Instead of just guessing and muddling along. Commented Aug 30, 2017 at 5:54
  • Yes, sorry I alluded to using the documentation because it was obvious to me in this case but you are right you should consult the documentation once you have found the point at which the regex breaks. Commented Aug 30, 2017 at 9:13