import re
text = r"\test\{list}\tasks, \test\{list}\{task}, \task\{id:[0-9]{6}}, \file\{task:[0-9]{6}}*name, \file\{test}*name"
print( re.findall(r'{[a-zA-Z][^{}:]*}', text) )
aW1wb3J0IHJlCnRleHQgPSByIlx0ZXN0XHtsaXN0fVx0YXNrcywgXHRlc3Rce2xpc3R9XHt0YXNrfSwgXHRhc2tce2lkOlswLTldezZ9fSwgXGZpbGVce3Rhc2s6WzAtOV17Nn19Km5hbWUsIFxmaWxlXHt0ZXN0fSpuYW1lIgpwcmludCggcmUuZmluZGFsbChyJ3tbYS16QS1aXVtee306XSp9JywgdGV4dCkgKQ==