updated for version 7.3.1093
Problem: New regexp engine: When a sub expression is empty \1 skips a
character.
Solution: Make \1 try the current position when the match is emtpy.
diff --git a/src/testdir/test64.ok b/src/testdir/test64.ok
index 31baa4f..0e2f772 100644
--- a/src/testdir/test64.ok
+++ b/src/testdir/test64.ok
@@ -815,6 +815,9 @@
OK 0 - \(a\)\(b\)\(c\)\(dd\)\(e\)\(f\)\(g\)\(h\)\(i\)\1\2\3\4\5\6\7\8\9
OK 1 - \(a\)\(b\)\(c\)\(dd\)\(e\)\(f\)\(g\)\(h\)\(i\)\1\2\3\4\5\6\7\8\9
OK 2 - \(a\)\(b\)\(c\)\(dd\)\(e\)\(f\)\(g\)\(h\)\(i\)\1\2\3\4\5\6\7\8\9
+OK 0 - \(\d*\)a \1b
+OK 1 - \(\d*\)a \1b
+OK 2 - \(\d*\)a \1b
OK 0 - <\@<=span.
OK 1 - <\@<=span.
OK 2 - <\@<=span.