Add support for pem content

[spacemanspiff2007]

I am trying to get the content:

e.g. if I have this certificate

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

then I'd like to have a possibility to get this:
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Do you think this is out of scope for this library or would you accept a PR that implements this?

[hynek]

Are you sure that's useful? Doesn't everything require the full envelope?

[spacemanspiff2007]

I want to access the b64 encoded certificate data for further processing so I thought this might be the way to go.

If you think that's out of scope for your lib that's no problem - it's a rather trivial feature.

[hynek]

Since we’re extracting using a regexp it should be a matter of adding two parens and adding an attribute. I was just wondering what’s it could be good for. :)