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Construct a regular expression that recognizes the following language of strings over the alphabet {0 1}:

The language consisting of the set of all bit strings that start with 00 or end with 101 (or both).

Syntax

The union is expressed as R|R, star as R*, plus as R+, concatenation as RR.

Epsilon is not supported but you can write R? for the regex (R|epsilon).

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  1. 25 June, 10:52
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    00 (01) * +| (01) * +101|00 (01) * +101

    Rest detail is in explanation.

    Explanation:

    (01) * means all the strings comprising of 0 and 1

    when we add + the set includes empty sets as well. and for or we use union, and this can be done using the | sign.

    And for concatenation, we have like 00 (01) * etc. Hence, the above regular expression.
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