End of group (virtual) operators were sometimes dumping core because
the memory wasn't being properly initialized.
From: Charles Hannum <mycroft@NetBSD.ORG>

4.4BSD snapshot (revision 8.1); add 1993 to copyright

fix broken label handling (rewrite label code completely)

complain if whitespace after w, r, :, b or t objects, or if a label
isn't used

handle backslash and ampersand correctly; from Diomidis; examples:
echo '\foo' | sed -e 's/\\/\\e/' -e 's/^/\\\&/'
echo "foo" | sed -e 's/./\\\&/' produces \foo instead of \&oo.
echo "foo" | sed -e '

handle backslash and ampersand correctly; from Diomidis; examples:
echo '\foo' | sed -e 's/\\/\\e/' -e 's/^/\\\&/'
echo "foo" | sed -e 's/./\\\&/' produces \foo instead of \&oo.
echo "foo" | sed -e 's/./\\&/' produces \&oo instead of \foo.

show more ...

don't access entries multiple times; from Diomidis

make match (pmatch) a single global structure; change compile_re to
calculate max nsub; addresses can't set REG_NOSUB because of default RE's

make empty RE's work, some minor cleanups, too

updated error messages from Diomidis

date and time created 92/08/23 18:25:29 by bostic