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Which of the following symbol is used for matching the immediately preceding character?

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Which of the following symbol is used for matching the immediately preceding character?

(a) *

(b) $

(c) [ ]

(d) %

I had been asked this question during an interview.

My question is based upon grep command in chapter Filters using Regular Expressions of Unix

1 Answer

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Best answer
The correct answer is (a) *

To explain: The asterisk (*) refers to the immediately preceding character. It can match the previous character which can occur any number of times or not at all. For example, g* can match a null string along with g, gg, ggg, gggg and so on.

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