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Recent questions tagged regex

in AUTOMATA THEORY AND APPLICATIONS
Write a regular expression for a language over the alphabet {a, b} that accepts all strings starting with 'a' and ending with 'b'.

Write a regular expression for a language over the alphabet {a, b} that accepts all strings starting with 'a' and ending with 'b'.
Answer : Let's dive deep into the regular expression `a(a|b)*b` and understand exactly how it works, component by component. ### The Goal First, let's restate the rule we want to enforce: 1. The string **must** ... Does it end with `b`? No, it ends with `a`. 3. The string is immediately **rejected**....

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