I would vote for perl
But given the situation i would prefer python. In the end, if you implement anything more specific than this it will be a lot of work later, when the cries start "I wanted to do X, but I can't, because it is not supported by Y!". In time there will be libraries with specific functions, if people really want them. Restriction now will only come back to haunt you.
My EUR 0.02
Sven