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  13. Date: Tue, 05 Nov 1996 10:02:28 +0000
  14. To: urn-ietf@bunyip.com
  15. From: Bob Briscoe <rbriscoe@jungle.bt.co.uk>
  16. Subject: [URN] NAPTR substitution expression grammar
  17. Sender: owner-urn-ietf@services.bunyip.com
  18. Precedence: bulk
  19. Reply-To: Bob Briscoe <rbriscoe@jungle.bt.co.uk>
  20. Errors-To: owner-urn-ietf@bunyip.com
  21.  
  22. Comments on draft-ietf-urn-naptr-00.txt (cont.):
  23.  
  24. 2. Substitution expression grammar
  25. 2.1 You claim to be copying sed ERE syntax (with the caveat it may all
  26. change to cover UTF-8). To avoid confusion for sed gits like me, could you
  27. consider using the escaped parentheses \( and \) to do back refs, rather
  28. than the one character ones ( and ) which simply imply grouping in POSIX
  29. EREs by my understanding.
  30.  
  31. 2.2 Also, it would be friendly to allow any delimiter, like sed does, not
  32. just "/" (e.g. "!.*//\([^/:]+\)!\1!i" is a lot more readable than
  33. "/.*\/\/\([^\/:]+\)/\1/i").
  34.  
  35. Bob
  36. ____________________________________________________________________________
  37. Bob Briscoe         http://www.labs.bt.com/people/briscorj/index.htm
  38.