Problem:
Suppose you want to replace a substring in some file names with another,
so you do a File Rename operation with source pattern:
*OLDSTRING*
and target pattern:
\1NEWSTRING\2
If OLDSTRING occurs inside a filename, it is replaced correctly, but if
at the beginning or end of the filename, the corresponding zero-length
wildcard match is replaced by literal \1 or \2, respectively.
Expected
Wildcards that match a zero-length substring should be substituted with
an empty string.
Thanks boris<> for the original patch.
Signed-off-by: Andrew Borodin <aborodin@vmail.ru>
5ecf12483a