Hey, Earl

Problem 1

Any string that starts with ye and ends with one or more s, with no other characters in between.

Problem 2

Any string that starts with yes and ends with zero or more spaces, with no other characters in between.

Problem 3

You could instead use, e.g., my name is (\S*) or my name is ([^\s]*).

Problem 4

^(EMMA)*$

Problem 5

EMMA, EMMAEMMA, EMMAEMMAEMMA

Problem 6

RODRIGO