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The problem is that \\3 does not correspond to \\(\\]\\)? (concat "\\(\\[\\)?" ARXIV "\\(\\]\\)?") Gives you the following regexp: "\\(\\[\\)?\\(arXiv:\\([0-9]+\\)\\.\\([0-9]+\\)\\(v[0-9]+\\)?\\|\\(astro-ph\\|cond-mat\\|gr-qc\\|hep-ex\\|hep-lat\\|hep-ph\\|hep-th\\|math-ph\\|nlin\\|nucl-ex\\|nucl-th\\|physics\\|quant-ph\\|math\\|CoRR\\|q-...


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