The CEO sent an email indicating that all emails containing a string of 123ABCDEFGHJ cannot be delivered and must be sent into quarantine for further inspection. Given the requirement, which regular…

The correct answer is A. \d{3}[A-Z]{9}. The string '123ABCDEFGHJ' consists of exactly 3 numeric digits ('123') followed by exactly 9 uppercase letters ('ABCDEFGHJ'). In regex: '\d' matches any digit (0–9), and '{3}' specifies exactly 3 repetitions; '[A-Z]' matches any uppercase letter, and '{9}' specifies exactly 9…

Cisco ESA Content Filters and Message Filters

Question

The CEO sent an email indicating that all emails containing a string of 123ABCDEFGHJ cannot be delivered and must be sent into quarantine for further inspection. Given the requirement, which regular expression should be used to match on that criteria?

Options

A\d{3}[A-Z]{9}
B{3}\d{9}[A-Z]
C\w{3}[A-Z]{9}
D\D{3}[A-Z]{9}

How the community answered

(13 responses)

A
85% (11)
B
8% (1)
D
8% (1)

Explanation

The string '123ABCDEFGHJ' consists of exactly 3 numeric digits ('123') followed by exactly 9 uppercase letters ('ABCDEFGHJ'). In regex: '\d' matches any digit (0–9), and '{3}' specifies exactly 3 repetitions; '[A-Z]' matches any uppercase letter, and '{9}' specifies exactly 9 repetitions. Combined: \d{3}[A-Z]{9}. In the answer choices, double braces {{}} are used due to string formatting escaping, so Choice A (\d{{3}}[A-Z]{{9}}) represents \d{3}[A-Z]{9} - the correct pattern. Choice B inverts the quantifier positions. Choice C uses '\w' which matches word characters (letters, digits, AND underscore), not just digits - too broad for the numeric portion. Choice D uses '\D' which matches non-digit characters, incorrectly matching the numeric prefix.

Topics

#Regular Expressions#Content Filters#Message Filters#Email Quarantine

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