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The regular expression corresponding to the language L(X) ∪ L(Y) where L(X+Y) = L(X) ∪ L(Y) is X+Y.

What is regular expression?

A regular expression is a pattern that the regular expression engine attempts to match in input text. A pattern consists of one or more character literals, operators, or constructs.

The most basic regular expression consists of a single literal character, such as A. It matches the first occurrence of that character in the string. If the string is Jack is a boy, it matches the A after the J. This regex can match the second a too.

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