add support for new style arXiv identifiers with class #31
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While working on Inspire we have seen cases where arXiv identifiers are in the mixed old- and new-style form, where the identifier is of the new style, but is prefixed with the class, similarly to the old-style arXiv identifiers (e.g.
arXiv:hep-th/1601.07616
). While this is technically incorrect according to the specification, examples of such cases exist, and can be found for example in this paper, citation [22]. It is useful to be able to parse those, and this PR aims to provide such functionality toidutils
.