regex regression?

Hi,

Looks like regcomp() doesn't detect invalid backreferences on
-CURRENT, though it works normally on 6.3-RELEASE.

simple testcase:

6.3-RELEASE:
$ echo test | sed 's/test/\1/'
sed: 1: "s/test/\1/": \1 not defined in the RE

-CURRENT:
$ echo test | sed 's/test/\1/'
Segmentation fault (core dumped)


Yuri