Use a regular expression to find all emails in a given string in Python.
myString = "my name is Joe and my email is joe@example.com"
import re 

pattern = "[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+"

result = re.findall(pattern, myString)

print(result) # Output will be ["joe@example.com"]