LPI
101-350 · Question #87
What does the ? symbol mean in the following grep regular expression: grep '^d[aei]\?d$' /usr/share/dict/words
The correct answer is C. Match the preceding character set ([aei]) zero or one times. See the full explanation below for the reasoning.
Question
What does the ? symbol mean in the following grep regular expression: grep '^d[aei]?d$' /usr/share/dict/words
Options
- AMatch the preceding character set ([aei]) one or more times.
- BMatch the preceding character set ([aei]) zero or more times.
- CMatch the preceding character set ([aei]) zero or one times.
- DMatch a literal ? symbol.
How the community answered
(27 responses)- A4% (1)
- B15% (4)
- C78% (21)
- D4% (1)
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