English phrase associated with regular expression

Reference no: EM13700040

Question: Describe in English phrase the language associated with the following regular expression

((a+b)a)*

All the words with even lengths and which start in a's or b's and end in a's.

The language also adds null string. Which seems that the description accepts bbba, which is not in language. I have the answer already but i do not understand it; I need expert to guide through it step by step. thanks!

Reference no: EM13700040

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