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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

Answer»

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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