import re

text = 'ABC 123 xYZ 456 @$! 100'

PATTERN = re.compile(r'\d\d\d')
#matches = PATTERN.search(text) #searches 1st instance of the match
matches = PATTERN.finditer(text) #iteratively matches every instance of the match

for i in matches:
    #print(i)
    print(i.group()) #returns the match value