import re
s = 'Phone 18020210 914 171 717 mailbox 43, 1003 Florvaag\nEx2: "Phone 18020210 N 0914 171 717 mailbox 43, 1003 Florvaag\nPhone 18020210 N0914 171 717 mailbox 43, 1003 Florvaag'
print( re.findall(r'\b0?\d{3}\s\d{3}\s\d{3}\b', s) )