How to exclude characters when counting digits

[ichabod801]

digit_re = re.compile('\d+')

def re_count(text):
    return len(text) - len(digit_re.sub(text, ''))

Output:
count_func took 7.043 sec
smart_count_digits took 0.945 sec
ick_count took 0.622 sec
re_count took 0.061 sec

Edit: Function gave wrong answer, corrected function and reran times.