Norihiro Tanaka wrote:
By this change, each fragment is divided into groups by whether the fragment includes back reference in a pattern or not. a frgment which includes back reference constitutes group, and all frgments which include back reference also constitute a group.
Surely this is not sufficient. An invocation of grep like this: grep -E '(a b)'should be an error, but with the proposed patch won't it be equivalent to "grep -E '(a|b)'" since the pattern has no back-references?
