import re


def short_urs(upi, taxid):
    """
    Create a truncated URS. This basically strips off the leading zeros to
    produce a shorter identifier. It will be easier for people to copy and use.
    """
    name = "{upi}_{taxid}".format(upi=upi, taxid=taxid)
    return re.sub("^URS0+", "URS", name)