Question at position 22 Which of the following strings match(es) the regular expression in following command? grep “^[ABCa-z][23]” Notes.TXT ABCa-z2345x22345Ba32ABCAll of these.

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BlackTom AI · Accepted Answer

The question asks which strings match the given regular expression grep “^[ABCa-z][23]”.
Here we must check the first character against the character class [ABCa-z], and the second character must be either 2 or 3.
Option 1: ABCa-z2345. The first character is 'A', which is allowed by [ABCa-z]. The second character is 'B', which is not 2 or 3. Therefore this does not match, so this option is incorrect.
Option 2: x22345. The first character 'x' is a lowercase letter, which falls within a-z, hence allowed by [ABCa-z]. The second character is '2', which is in [23], so the two-character prefix satisfies the regex. The rule doesn’t constrain the rest of the string, so this option matches.
Option 3: Ba32ABC. The first character 'B' is allowed, but the second character 'a' is not 2 or 3. This fails to meet the [23] requirement, so it does not match.
Option 4: All of these. Since not all prior options match, this cannot be true. The phrase 'All of these' would require every option to match, which is false here.
Thus, among the given choices, only the second option satisfies the pattern.

Question at position 22 Which of the following strings match(es) the regular expression in following command? grep “^[ABCa-z][23]” Notes.TXT ABCa-z2345x22345Ba32ABCAll of these.

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Question at position 22 Which of the following strings match(es) the regular expression in following command? grep “^[ABCa-z][23]” Notes.TXT ABCa-z2345x22345Ba32ABCAll of these.

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