157 questions linked to/from How to prove that a language is not regular?
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### Is this language L regular?

Let's say we have the language L = {w $\in$ {a,b}$^*$ : ($\exists n \in \mathbb{N}$)[$w|_b = 5^n$]}. I want to know if this is a regular language or not. How do I go about doing this? I'm familiar ...