EX294 Transform data with filters and plugins Practice Question
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.
Exhibit
Refer to the exhibit.
```
- name: Check Apache status
hosts: webservers
tasks:
- name: Get URL content
uri:
url: http://localhost/server-status
return_content: yes
register: result
- name: Debug output
debug:
var: result
```
Output:
```
ok: [web01] => {
"result": {
"changed": false,
"content": "<html><body><h1>Apache Status</h1>...</body></html>",
"status": 200,
"url": "http://localhost/server-status"
}
}
```
Refer to the exhibit. After running the playbook, the 'content' field contains an HTML page. The team wants to extract the text inside the <h1> tags using Ansible filters. Which of the following tasks correctly extracts the content of the <h1> element?
Why wrong: Incorrect: 'regex_search' returns the entire match or a list of groups, not a clean string.
D
set_fact: heading="{{ result.content | regex_findall('<h1>(.*)</h1>') | first }}"
Why wrong: Incorrect: 'regex_findall' returns a list of matches, but using | first is valid; however, the correct filter is 'regex_replace' to extract.
Option A is correct because the `regex_replace` filter with the pattern `'.*<h1>(.*)</h1>.*'` and replacement `'\1'` performs a greedy match across the entire HTML content, replacing everything with the captured group inside the `<h1>` tags. This effectively extracts the text between the `<h1>` tags, as the backreference `\1` refers to the first capture group `(.*)`.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
Incorrect: 'regex_search' returns the entire match or a list of groups, not a clean string.
✗
set_fact: heading="{{ result.content | regex_findall('<h1>(.*)</h1>') | first }}"
Why it's wrong here
Incorrect: 'regex_findall' returns a list of matches, but using | first is valid; however, the correct filter is 'regex_replace' to extract.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between `regex_replace` (which replaces the entire matched string with a replacement) and `regex_search`/`regex_findall` (which return the matched string itself), leading candidates to pick options that return the full tag instead of just the inner text.
Detailed technical explanation
How to think about this question
The `regex_replace` filter in Ansible uses Python's `re.sub()` under the hood, where the replacement string can reference capture groups with `\1`, `\2`, etc. The greedy `.*` at the start and end of the pattern ensures the entire string is consumed, so the replacement yields only the captured group. This is a common technique for extracting a substring from a larger string when you want to discard everything else, but beware of greedy vs. non-greedy matching if multiple `<h1>` tags exist; in that case, `.*` would match as much as possible, potentially capturing across tags.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Transform data with filters and plugins — This question tests Transform data with filters and plugins — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: set_fact: heading="{{ result.content | regex_replace('.*<h1>(.*)</h1>.*', '\1') }}" — Option A is correct because the `regex_replace` filter with the pattern `'.*<h1>(.*)</h1>.*'` and replacement `'\1'` performs a greedy match across the entire HTML content, replacing everything with the captured group inside the `<h1>` tags. This effectively extracts the text between the `<h1>` tags, as the backreference `\1` refers to the first capture group `(.*)`.
What should I do if I get this EX294 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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