Exam 200-201 topic 1 question 228 discussion

from chatgpt: The correct regex for capturing the phrase "File: Clean." is: C. File: Clean This regex simply matches the literal string "File: Clean" without any additional characters or assertions. If you want to capture the entire line containing "File: Clean.", including any characters that might come after it, you should use option D: D. ^File: Clean$

To capture the phrase "File: Clean" from a Cisco device using regex in a SIEM platform, the analyst should use: ^File: Clean$ This regex pattern matches the exact string "File: Clean" with ^ indicating the start of the line and $ indicating the end of the line, ensuring an exact match. So, the correct answer is ^File: Clean$.

C is the only possible answer because it can extract/parse both the words even if they are between other characters (as we can commonly find in a log file) D is wrong because it only matches if the log fields are separated by a "line feed" or "carriage return" (\n or \r in regex), which is quite rare to find in common logs

Would be more like: ^File: Clean\.$ As the \ marks the dot (.) as mandatory

None of the regex exactly matches "File: Clean.". The closes one is C if "." is ignored.

B. obviously is incorrect. A. is incorrect because it will match (File: Clean) followed by any number of characters. D. is incorrect because it will match only if there is no characters before and after the phrase (File: Clean). Therefore the best answer is C

An Example The antivirus scan was successful. File: Clean. The system is secure now. To extract the phrase "File: Clean" and create a custom property, you can use the following regex: File: Clean This regex will match any occurrence of the exact phrase "File: Clean" in the log message, and the SIEM platform can then use this to create a custom property.

It´s D... https://regexone.com/lesson/line_beginning_end

This regular expression matches the exact phrase "File: Clean" from the beginning (^) to the end ($) of a line. The "^" and "$" symbols indicate the start and end of a line, respectively, ensuring that the match is for the exact phrase and not a substring of another phrase. The "(.*)" in option A would match any characters after "File: Clean," which is not what the analyst is looking for. Option B does not match the exact phrase, as it includes "Parent" in the match. Option C would match the phrase "File: Clean," but it wouldn't specify where the line starts or ends.

is it just me is it super shady how examtopic is claiming these are all free but you hit a paywall halfway through the topics....

If a caret ( ^ ) is at the beginning of the entire regular expression, it matches the beginning of a line. If a dollar sign ( $ ) is at the end of the entire regular expression, it matches the end of a line.

I think C is the answer bc "A" doesn't work for me bc (.*) implies anything after will match bc "." is a wildcard.

The period and the spaces are throwing me off. "A" does not match if you use the space in the answer. Can anyone elaborate on this?

tested with regex101, A matches well, D does not match.

https://www.cisco.com/c/en/us/td/docs/security/security_management/cs-mars/4-3/user/guide/local_controller/appreexp.html