grepping out invalid URIs

I have dbpedia's NTriple files. Some of them contain non absolute URIs, URI's that don't start with http://. This is causing problem to the parsing.

i.e. i开发者_开发知识库 have some triples that have URIs like <www.example.com> instead of <http://www.example.com>

I'd like to grep them out by negating them.

I tried, failing, with grep -v "^(<http)".

Any suggestion?

Edit

I probably made my point wrongly. These URI's aren't necessarily at the beginning of the line. That was my mistake in using the '^' operator as NOT. Also, I want to grep them out, with grep -v.

These are some sample lines:

<http://dbpedia.org/resource/Petrodvorets_Watch_Factory> <http://xmlns.com/foaf/0.1/homepage> <www.raketa.su> .

<http://dbpedia.org/resource/ABS_network> <http://xmlns.com/foaf/0.1/homepage> <www.absn.tv> .

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grep -P '^(?!<http).*'

(?!...) is a negative lookahead I did not test it so if you that does not work, search the web for 'regex negative lookahead' that should do the job

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To handle multiple URIs per line the working regex is:

grep -P '<(?!http(s)?:\/\/).*>', to start with.

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"^(<http)" would only match if "<http" is at the beginning of the line. Is that true in your case?