New Defects reported by Coverity Scan for LyX

[Thibaut Cuvelier]

On Wed, 8 Jul 2020 at 14:54, Jean-Marc Lasgouttes <lasgouttes at lyx.org>
wrote:

> Item 1 is about checking return of regex_match
>
> Item 2 is probably fixed by an earlier definition of the "label" variable
>

Here are two patches, one per item. I also included Kornel's comment about
std::regex_match.
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