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POSIX identifies regular expressions as belonging to ____ categories.

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POSIX identifies regular expressions as belonging to ____ categories.

(a) 3

(b) 2

(c) 4

(d) 5

This question was posed to me by my college director while I was bunking the class.

Question is from grep command topic in division Filters using Regular Expressions of Unix

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Correct choice is (b) 2

The best I can explain: POSIX identifies regular expressions as belonging to two categories i.e. regular and extended.

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