+const char *luaM_checkrx(lua_State *Ls, int narg)
+{
+ const char *s = luaL_checkstring(Ls, narg);
+ char buf[STRING];
+
+ if (rx_validate(s, buf, ssizeof(buf))) {
+ s = lua_pushfstring(Ls, "invalid regexp: `%s'", buf);
+ luaL_argerror(Ls, narg, s);
+ return NULL;
+ }
+
+ return s;
+}
+
+char *luaM_pathnew(const char *val)
+{
+ char path[PATH_MAX];
+ _mutt_expand_path(path, sizeof(path), val, 0);
+ return m_strdup(path);
+}
+
+rx_t *luaM_rxnew(const char *val)
+{
+ if (m_strisempty(val))
+ val = ".";
+
+ return rx_compile(val, mutt_which_case(val));
+}
+