In AMOS, being able to restrict Substring to English (en) or other language

Like exposed in https://lang.moodle.org/mod/forum/discuss.php?d=8432 it would be helpful to be able, in AMOS, to (optionnaly) restrict the Substring search to the english strings, or at the opposite to one language pack.

Because by default, it searches in all languages (english include), and it's sometimes problematic.

For exemple, if you want to find all empty strings (via regex search ^$), you perhaps only want  english ones (or the opposite).

If i want to find french strings containing the english apostrophe/quote character (') to replace it by the french apostrophe character ('), i don't want all english strings containing this.

There are certainly plenty of other use cases, but you understand the aim.