@register.filter
def regex_comma_number(value,arg):
    import re
    

    __test__ = {}
    re_digits_nondigits = re.compile(r'\d+|\D+')
        
    parts = re_digits_nondigits.findall(arg % (value,))
    for i in xrange(len(parts)):
        s = parts[i]
        if s.isdigit():
            r = []
            for j, c in enumerate(reversed(s)):
                if j and (not (j % 3)):
                    r.insert(0, ',')
                r.insert(0, c)
            parts[i] = ''.join(r)
            break
    return ''.join(parts)