import re
instr = """
Expression: It's been a while man.
Expression: How have you been moron?
Expression: Good to see you dear.
Greeting: How is everything dear?
Greeting: Hi dear, how are you?
"""
pattern = r'^[^:]*:\s*(.*\bdear\b.*)'
for item in instr.splitlines():
res = re.search(pattern, item)
if res:
print(res.group(1))
aW1wb3J0IHJlCgppbnN0ciA9ICIiIgpFeHByZXNzaW9uOiBJdCdzIGJlZW4gYSB3aGlsZSBtYW4uCkV4cHJlc3Npb246IEhvdyBoYXZlIHlvdSBiZWVuIG1vcm9uPwpFeHByZXNzaW9uOiBHb29kIHRvIHNlZSB5b3UgZGVhci4KR3JlZXRpbmc6IEhvdyBpcyBldmVyeXRoaW5nIGRlYXI/CkdyZWV0aW5nOiBIaSBkZWFyLCBob3cgYXJlIHlvdT8KIiIiCnBhdHRlcm4gPSByJ15bXjpdKjpccyooLipcYmRlYXJcYi4qKScKCmZvciBpdGVtIGluIGluc3RyLnNwbGl0bGluZXMoKToKCXJlcyA9IHJlLnNlYXJjaChwYXR0ZXJuLCBpdGVtKQoJaWYgcmVzOgoJCXByaW50KHJlcy5ncm91cCgxKSk=