Can someone check these for me...
Express each of these sets using a regular expression:
a)The set containing all strings with 0, 1, or 2 bits.
b)The set of strings of two 0's, followed by zero or more 1's, and ending with a 0
c)The set of strings with every 1 followed by two 0's.
d)The set of strings ending in 00 and not containing 11. *NOT SURE
e)The set of strings containing an even number of 1's. *NOT SURE