You must start the regular expression with a ^ and end with a $ to generate the behavior we desire, and wrap it in (). So in other words ^(stuff goes here)$

MAKE SURE to USE FLAVOR PCRE2 (PHP >= 7.3) for REGEX 101.

Use the website (regex101.com). Note that you can only use (), | (for the books +), and the Kleene Star *. Also assume the alphabet {a b}

Copy and paste the following tests.

Make sure to just submit a plain text copy of the regular expression.

Assume common sense applies (e.g. do not simply write a regular expression that ORs together all the tests).

5. ODD-ODD, all strings that have an odd number of as and an odd number of bs

These strings should have FULL matching

ab

aaab

aaaaab

aaaaaaab

baaa

baaaaa

ba

bbba

bbbbba

bbbbbbba

abaa

ababab

aaaaabbb

These strings should NOT have FULL matching:

a

aa

aaa

b

bbb

bb

abba

aabb

aaabb

ababa

babbbba