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Missing SRE component in BNF

Hi there,

In SRE Syntax section, there are bunch of missing items in BNF but
described in below section. Following items are missing. (Not sure
if these are complete set, though.)

- English names of 'Repeating patterns'
- backref
- English names of 'Non-Greedy Patterns'

Followings are charset

- char-range
- complement
- difference

BTW, why do 'look-ahead', 'look-behind', 'neg-look-ahead' and 'neg-look-
behind' not have short name like '?=', '?!', '?<-' and '?<!'? Not sure
how often these are used but it might be convenient to have short names.


Takashi Kato
E-mail: ktakashi@xxxxxxxxx