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Which of the following is not a subset of BRE (basic regular expression) character subset?

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Which of the following is not a subset of BRE (basic regular expression) character subset?

(a) *

(b) .*

(c) ^$

(d) ch+

I had been asked this question in examination.

This interesting question is from grep command topic in division Filters using Regular Expressions of Unix

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Correct answer is (d) ch+

The best I can explain: The basic regular expression character subset doesn’t contain ch+, as it is a part of the extended regular expression.

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