Regular Expression for Strings with even number of b's followed by the letter c followed by an odd number of a's

Question

I have managed to figure out the regular expression for even number of b's and odd number of a's through (bb|aa|(ba|ab)(bb|aa)*(ab|ba))*(a|(ba|ab)(aa|bb)*b)

What if I need the following sequence:

1. Even number of b's
2. Followed by the letter 'C'
3. Followed by odd number of a's

any idea?

Answer 1

Try this (zero is an even number):

^(bb)*ca(aa)*$