import re
s = "The {name_of_list} list contains {list:a, b, and c}. This list should be formatted as a, b, and c."
print(re.findall(r'\{[^{}]*?:a, b, and c}', s))
aW1wb3J0IHJlCnMgPSAiVGhlIHtuYW1lX29mX2xpc3R9IGxpc3QgY29udGFpbnMge2xpc3Q6YSwgYiwgYW5kIGN9LiBUaGlzIGxpc3Qgc2hvdWxkIGJlIGZvcm1hdHRlZCBhcyBhLCBiLCBhbmQgYy4iCnByaW50KHJlLmZpbmRhbGwocidce1tee31dKj86YSwgYiwgYW5kIGN9JywgcykpCg==