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  3. write the re for identifiers that can consist of a

Write the RE for identifiers that can consist of any sequence of letters (l) or digit...

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Programming

Write the RE for identifiers that can consist of any sequence ofletters (l) or digit (d) or \"_\" but the first char must be a letterand the last char cannot be a \"_\"

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So as given in the question weneed to write a Regular Expression RE whichconsists of any sequence of letters we representletters as l or any sequence ofdigits we represent digits as d orthe particular symbol Here a condition isgiven that is the first char or symbol must be aletter which means must be l andnot any digit d or symbol Also thelast char or symbol can not be the symbol So what can our language be Let us first see the language withexamples Language L can be l ld ll ld ll    See Answer
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