import re
r = re.compile(r'\argentina\b')
print(r.search('argentina')) # None
# chr(0x07) corresponde ao \a (BELL character)
print(r.search(chr(0x07) + 'rgentina')) # Match
aW1wb3J0IHJlCgpyID0gcmUuY29tcGlsZShyJ1xhcmdlbnRpbmFcYicpCnByaW50KHIuc2VhcmNoKCdhcmdlbnRpbmEnKSkgIyBOb25lCgojIGNocigweDA3KSBjb3JyZXNwb25kZSBhbyBcYSAoQkVMTCBjaGFyYWN0ZXIpCnByaW50KHIuc2VhcmNoKGNocigweDA3KSArICdyZ2VudGluYScpKSAjIE1hdGNo