[Fontconfig-bugs] [Bug 40648] Regular expression support in comparison for <test>

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=40648

--- Comment #7 from Behdad Esfahbod <freedesktop at behdad.org> ---
(In reply to comment #6)
> another idea for regexp use case is:
> 
> <match>
>   <test name="psname" mode="regex">
>     <string>(.*)\-(UniJIS\-UTF8\-H)$</string>
>   </test>
>   <edit name="family" mode="regex_replace">
>     <string>\1</string>
>   </edit>
>   <edit name="pscmap" mode="regex_replace">
>     <string>\2</string>
>   </edit>
>   <edit name="lang" mode="assign">
>     <langset><string>ja</string></langset>
>   </edit>
> </match>
> 
> We could have the bunch of rules against CMaps to determine the family name
> and the lang according to the psname in the pattern.

This is much harder to implement in the current codebase.

One thing I don't like is matching for things like "pa.*" as that would also
match things like "par".  But I guess that can be fixed by a more involved
regexp.

I'm not opposing this per se, just pointing out details that need to be taken
into consideration.

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