filename: more efficient

Author: scivision

+stdlib/filename.m

@@ -14,9 +14,21 @@
 % because by our definition, a trailing directory component is not part of the filename
 % this is like C++17 filesystem::path::filename
 
-parts = strsplit(stdlib.posix(p), '/');
+s = '/';
+if ispc()
+  s = '[/\\]';
+end
+
+f = char(p);
 
-f = parts{end};
+im = regexp(f, s, 'end');
+if ~isempty(im)
+  if im(end) == length(f)
+    f = '';
+  else
+    f = f(im(end)+1:end);
+  end
+end
 
 if isstring(p)
   f = string(f);

test/TestFilename.m

@@ -5,7 +5,7 @@
 {'', ''}, ...
 {"", ""}, ...
 {"/a/b/c", "c"}, ...
-{'/a/b/c/', ''}, ...
+{'/a/b/', ''}, ...
 {'a/b/c.txt', 'c.txt'}, ...
 {"a/b/c.txt.gz", "c.txt.gz"}, ...
 };