Exam CAS-004 topic 1 question 476 discussion

Actual exam question from CompTIA's CAS-004

Question #: 476
Topic #: 1

A security analyst is reviewing a new IOC in which data is injected into an online process. The IOC shows the data injection could happen in the following ways:

• Five numerical digits followed by a dash, followed by four numerical digits; or
• Five numerical digits

When one of these IOCs is identified. the online process stops working. Which of the following regular expressions should be implemented in the NIPS?

A. ^\d{4}(-\d{5})?$
B. ^\d{5}(-\d{4})?$
C. ^\d{5-4}$
D. ^\d{9}$

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Suggested Answer: B 🗳️

by MacherGaming at July 12, 2024, 2:55 p.m.

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MacherGaming

Highly Voted 1 year ago

Selected Answer: B

B - ^\d{5}(-\d{4})?$: Spend a few hours on https://regex101[.]com/ if you don't already know it. ^ - position at the start of the line \d - matches any digit [0-9] {5} - matches the previous token 5 times (in this case '\d' or any digit) ( ....)? - Capture group, includes a match on the first token (our 5 digits) and what's inside the (...). -\d{4} - a dash "-" followed by any 4 digits $ - position at the end of a line

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