[PATCH] lyxpreview_tools.py: fix a regular expression

[Scott Kostyshak]

Attached is a patch for lyxpreview_tools.py, but I don't know Python
well and I don't know how to test whether this code works as intended
now or not. All I know is it gets rid of the error.

I originally saw that error on master when opening the User Guide with
Preview enabled.

Can someone give the patch a check?

Best,

Scott
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