add TSamLast command for reexecuting last running tests

lua/test-samurai/runners/go.lua

@@ -67,11 +67,16 @@ local function find_t_runs(lines, func)
   return subtests
 end
 
+local function escape_go_regex(s)
+  s = s or ""
+  return (s:gsub("([\\.^$|()%%[%]{}*+?%-])", "\\\\%1"))
+end
+
 local function build_run_pattern(spec)
   local name = spec.test_path or ""
-  local escaped = name:gsub("(%W)", "%%%1")
+  local escaped = escape_go_regex(name)
   if spec.scope == "function" then
-    return "^" .. escaped .. "$|^" .. escaped .. "/"
+    return "^" .. escaped .. "($|/)"
   else
     return "^" .. escaped .. "$"
   end