From: Kevin Lyda <kevin@ie.suberic.net>
Date: Tue, 29 Aug 2017 07:12:44 +0000 (+0100)
Subject: Fix version processing on BSD systems.
X-Git-Url: https://git.madduck.net/code/vcsh.git/commitdiff_plain/b469b65f0110f09dec06a7061975947647716332?ds=sidebyside;hp=b469b65f0110f09dec06a7061975947647716332

Fix version processing on BSD systems.

BSD systems ship with the original sed; lacking a host of GNU
extensions. However both GNU sed and POSIX sed support the -E flag
for extended regular expressions which are close to the change this
is replacing.

See the descriptions of extended REs in IEEE Std 1003.2 (aka POSIX.2)
or re_format(7) on BSD systems. What matters for this is that the
+ operator works and that it and the grouping operators no longer
need to be escaped.
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