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On 16/07/15 05:44 PM, Jonathan Goble wrote:
On Thu, Jul 16, 2015 at 4:36 PM, Rena <> wrote:
On Jul 16, 2015 6:04 AM, "John Hind" <> wrote:

New character classes are unlikely to break existing code.
Except code that builds patterns from user input and escapes it like gsub(s,
"%W", "%%1").
Solution: forget %^ and %$ completely and use %b (beginning) and %e
(end) instead. Neither of those letters are currently in use for
character classes, so nothing would break, and the letters would be
easy to remember.
%b is already in use, actually, but for %b() or %b[] or %b`'

See "Pattern Item":

Plus, by using letters, the standard trick of capitalizing the letter
can be used to say "anything but the beginning/end of the string". Not
sure how useful that would be, but it would be available if someone
wanted it.

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