Use regex for filename basename snippet

.vim/snips/all.snippets

@@ -2,6 +2,6 @@ snippet fne "Filename (+extension)" i
 `!p snip.rv = snip.fn`
 endsnippet
 
-snippet fn "Filename basename" i
+# snippet ^fn "Filename basename" ir
-`!p snip.rv = snip.basename`
+# `!p snip.rv = snip.basename`
 endsnippet