The lack of POSIX interval expressions[*] (a.k.a. bounds, a.k.a.
repetition expressions) in regular expressions is listed under BUGS
in 'awk.1'. Apple's version of onetrueawk has supported these since
at least 2009, judging by the date stamp on their src/b.c in:
https://opensource.apple.com/tarballs/awk/awk-24.tar.gz
A bug report prompted NetBSD to swiftly integrate this code into
their awk. This commit is based on that NetBSD diff.
http://gnats.netbsd.org/53885f3e4c4ca1d
b.c:
- Backport POSIX-standard interval expressions support in regular
expressions via NetBSD from Apple awk-24 (20070501).
main.c:
- Bump version ID.
FIXES:
- Add note and credit for this feature.
awk.1: section BUGS:
- Remove line saying interval expressions are not supported.
_________
[*] http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_04_06
Arnold D. Robbins
Martijn Dekker
Brian Kernighan