miRNA annotation package / converting mature_mirna_ids into ENTREZ symbols

Question

[lech.kaczmarczyk]

Hi All, How can I convert mature miRNA ID like the ones below into Entrez. I failed to find an annotation package that can handle such names. Of course it is possible to edit the names with regular expressions, but I would like to avoid that if possible.

mmu-miR-22-3p
mmu-miR-22-3p  
mmu-miR-143-3p
mmu-miR-143-3p
mmu-let-7d-5p

I guess it would be possible to do it with multiMiR package, but I also failed to figure out how.

Please help.