Improve regexes for parsing problem data

[mgrabovsky]

• Replace ranges with PCRE escapes, e.g. a-zA-Z → \w.
• Fix package name (NEV) parser to correctly handle epoch numbers. The epoch was previously assumed to be a prefix of the whole name (in ENV form), e.g. 1:findutils-4.7.0-4.fc33. In order to be consistent with abrt, DNF and RPM, we switch to NEV form, that is findutils-1:4.7.0-4.fc33.

Potentially related: #400

[packit-as-a-service]

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[xsuchy]

I think we can do that as we run under en locale. But beware that e.g. in Swedish locale the "w" is not part of \w

[mgrabovsky]

I think we can do that as we run under en locale. But beware that e.g. in Swedish locale the "w" is not part of \w

Ah, I didn't think about that. But now that I'm looking into the documentation\w includes “most characters that can be part of a word in any language, as well as numbers and the underscore”. So we should be fine regarding locales (although using the ASCII flag might be safer), but we're now accepting more than the original parser.

The change might have been too hasty. I will go and fix that.