Hiroki Sato d3d0d3a3b5 Add workaround for a back reference when no corresponding
parenthesized subexpression is defined.  For example, the
following command line caused unexpected behavior like
segmentation fault:

 % echo test | sed -e 's/test/\1/'

PR:		bin/126682
MFC after:	1 week
2008-11-09 01:10:21 +00:00
..
2008-02-09 09:12:02 +00:00
2008-02-09 09:12:02 +00:00
2007-04-06 08:43:30 +00:00
2008-02-09 09:12:02 +00:00