This EX294 practice question tests your understanding of transform data with filters and plugins. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An Ansible playbook needs to extract the domain name from a list of email addresses stored in variable `emails`. The domain appears after the '@' symbol. Which filter should be used?
split
Why wrong: split is a Jinja2 method, not a filter.
regex_replace
The pattern `.*@(.*)` with replacement `\1` extracts the domain.
urldecode
Why wrong: urldecode is for URL decoding, not email parsing.
base64
Why wrong: base64 is for encoding/decoding, not extraction.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
regex_replace
The `regex_replace` filter can extract the domain by matching the pattern `.*@(.*)` and replacing with `\1`, isolating the part after '@'. This is the correct approach because Ansible's Jinja2 filters include `regex_replace` for pattern-based string extraction, while `split` would require additional steps to isolate the domain.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
split
Why it's wrong here
split is a Jinja2 method, not a filter.
regex_replace
Why this is correct
The pattern `.*@(.*)` with replacement `\1` extracts the domain.
Related concept
Read the scenario before looking for a memorised answer.
urldecode
Why it's wrong here
urldecode is for URL decoding, not email parsing.
base64
Why it's wrong here
base64 is for encoding/decoding, not extraction.
Common exam traps
Red Hat often tests the misconception that `split` alone can extract a substring, but candidates forget that `split` returns a list and requires indexing, while `regex_replace` directly yields the matched group.
Detailed technical explanation
The `regex_replace` filter uses Python's `re.sub` under the hood, allowing capture groups and backreferences. For a list of emails, you would apply it with `map` or a loop: `{{ emails | map('regex_replace', '.*@(.*)', '\1') | list }}`. This is efficient for batch extraction, but note that the pattern must be greedy to handle multiple '@' symbols (e.g., `user@sub@domain.com` would extract `sub@domain.com`).
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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FAQ
Transform data with filters and plugins — This question tests Transform data with filters and plugins — Read the scenario before looking for a memorised answer..
The correct answer is: regex_replace — The `regex_replace` filter can extract the domain by matching the pattern `.*@(.*)` and replacing with `\1`, isolating the part after '@'. This is the correct approach because Ansible's Jinja2 filters include `regex_replace` for pattern-based string extraction, while `split` would require additional steps to isolate the domain.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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