more than one `--grep=<pattern>`, commits whose message
matches any of the given patterns are chosen (but see
`--all-match`).
++
+When `--show-notes` is in effect, the message from the notes as
+if it is part of the log message.
--all-match::
Limit the commits output to ones that match all given --grep,
Match the regexp limiting patterns without regard to letters case.
+--basic-regexp::
+
+ Consider the limiting patterns to be basic regular expressions;
+ this is the default.
+
-E::
--extended-regexp::
Consider the limiting patterns to be fixed strings (don't interpret
pattern as a regular expression).
+--perl-regexp::
+
+ Consider the limiting patterns to be Perl-compatible regexp.
+ Requires libpcre to be compiled in.
+
--remove-empty::
Stop when a given path disappears from the tree.