[PATCH] ed with perl-compatible regular expressions

[Shawn Wagner]

One of the options I mentioned in a prior email about getting
case-insensitive REs in ed was to support a more sophisticated flavor
of regular expression. This is the fruit of that idea.

The attached patch (Made against 1.18-pre2) adds a -P option to use
PCRE2 regular expressions. Passing --disable-pcre2 to the configure
script will leave this feature out. There's also a --utf8 option that
turns on PCRE2's advanced Unicode matching.

It also adds some tests for ed -E and ed -P, and mentions both in the
regular expression section of the texi documentation.

pcre2.patch
Description: Binary data