Automata Theory Questions
A regular expression with concatenation is a sequence of characters or symbols that represents a pattern or a set of strings. It is used to describe or match a specific pattern in a given set of strings. The concatenation operator, denoted by a dot (.), is used to combine two regular expressions together to form a new regular expression. This new regular expression represents the set of strings that can be obtained by concatenating strings from the original two regular expressions in all possible ways.