Snippets after latin letters

[QiaoJiao]

How can insert snippet, no matter what is before it? It just does not work after lating letters.

For example, I made snippet that convert two spaces to _ (space for trigger and space for shortcut), but it works only if not after English letters, so it is useless:
some_text — I need this without typing shift+-
some(space, space)text — not working, just two spaces
some(space, space, space)text — some _text (first space is not used)
字(space, space) — 字_ (working as 字 is not latin character)

How can I use snippets no matter what is before them?

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