Example 2

Regular Expression (Delimit with quotes)
String (Delimit with quotes)

What regular expression specifies the set of all lowercase alphabetic strings ending in 'b'?

Accepted:

b, ab, cb, bb,  zb,
aab, abb, bbb, zab, bab, fib,
aaab, baab, bbbb, flub 

Rejected:

a, abc, abbB, APPLE, Beauty, beast