[File] [PATCH] fix accidental 'any char' regexps

[Christos Zoulas]

Applied, thanks!

christos

> On Mar 23, 2022, at 5:13 AM, Dirk Müller <dirk at dmllr.de> wrote:
> 
> Hi,
> 
> ping on this one..
> 
> Am So., 13. März 2022 um 21:37 Uhr schrieb Dirk Müller <dirk at dmllr.de>:
>> 
>> In several occassions the regexps were using '\.' when '\\.'
>> was intended, as the libmagic parsing does one level of dequoting.
>> 
>> This is important as it causes "any char" to match rather than ".", and
>> makes the regexps fall to backtracking where not needed. So avoiding
>> that makes things more performant and more correct.
>> 
>> Also when we're returning version numbers, search for nonempty matches.
>> Add sanity check during compile step that prints a warning.
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