import re
foo = 'Please feed {me} some pistachio ice cream!'
r = re.compile('Please feed {{{}}} some {} ice cream!'.format('me', 'pistachio'))
print(r.findall(foo))
aW1wb3J0IHJlCmZvbyA9ICdQbGVhc2UgZmVlZCB7bWV9IHNvbWUgcGlzdGFjaGlvIGljZSBjcmVhbSEnCnIgPSByZS5jb21waWxlKCdQbGVhc2UgZmVlZCB7e3t9fX0gc29tZSB7fSBpY2UgY3JlYW0hJy5mb3JtYXQoJ21lJywgJ3Bpc3RhY2hpbycpKQpwcmludChyLmZpbmRhbGwoZm9vKSk=