[PATCH] lyxpreview_tools.py: fix a regular expression

[Kornel Benko]

Am Sat, 15 Feb 2020 21:15:17 +0100
schrieb Kornel Benko <kornel at lyx.org>:

> Am Sat, 15 Feb 2020 14:03:43 -0500
> schrieb Scott Kostyshak <skostysh at lyx.org>:
> 
> > 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  
> 
> Definitely better as the original. Works here as expected.
> Still one element making problems:
> 	Warning: Failed to produce 1 preview snippet(s)
> Looking at the lyxpreviewkn4998.log here, looks like it is not related to your patch.
> 
> Preview: Snippet 85 338603 0 465893
> [85]
> ! Undefined control sequence.
> l.628 x^{2}-2x-2\Rightarrow\question
>                                     {x_{1}}\answer{x_{2}}=1\question{+\sqrt{...
> The control sequence at the end of the top line
> of your error message was never \def'ed. If you have
> misspelled it (e.g., `\hobx'), type `I' and the correct
> spelling (e.g., `I\hbox'). Otherwise just continue,
> and I'll forget about whatever was undefined.
> 
> Other snippets are OK.
> 
> 	Kornel

OK, found the offending piece, attached

	Kornel
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