import re
check_string = 'I have a string 09A4N5'
m = re.search(r'\b[A-Z0-9]{6}\b', check_string)
if m:
print(m.group())
print(m.start(0))
aW1wb3J0IHJlCmNoZWNrX3N0cmluZyA9ICdJIGhhdmUgYSBzdHJpbmcgMDlBNE41JwptID0gcmUuc2VhcmNoKHInXGJbQS1aMC05XXs2fVxiJywgY2hlY2tfc3RyaW5nKQppZiBtOgogICAgcHJpbnQobS5ncm91cCgpKQogICAgcHJpbnQobS5zdGFydCgwKSk=