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Which of the following symbols are a set ofERE (extended regular expressions)?(a) +(b) –(c) ?(d) + and –I have been asked this question during an online interview.This key question is from grep command topic in chapter Filters using Regular Expressions of Unix

Answer»

Right ANSWER is (d) + and –

Explanation: The ERE set includes two special characters, + and ? which are USED in place of * to RESTRICT the matching scope. They signify the following,



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