- A
rex
Can extract and create new fields via regular expressions.
- B
eval
Can create new fields using expressions.
- C
table
Why wrong: Selects fields, does not create new ones.
- D
convert
Why wrong: Converts field formats but does not create new fields.
- E
fields
Why wrong: Includes or excludes fields, does not create new ones.
Question 320 of 520
How to Create New Fields in Splunk with rex and eval
This SPLK-1002 practice question tests your understanding of basic searching and transforming commands. 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.
Which TWO of the following commands can be used to create a new field from existing fields?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
rex
The `rex` command is correct because it uses regular expressions to extract new fields from existing field values. For example, `rex field=message "(?<newField>pattern)"` creates a new field named `newField` by matching a portion of the `message` field. This allows you to derive structured data from unstructured or semi-structured fields.
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.
- ✓
rex
Why this is correct
Can extract and create new fields via regular expressions.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
eval
Why this is correct
Can create new fields using expressions.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
table
Why it's wrong here
Selects fields, does not create new ones.
- ✗
convert
Why it's wrong here
Converts field formats but does not create new fields.
- ✗
fields
Why it's wrong here
Includes or excludes fields, does not create new ones.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Splunk often tests the distinction between commands that *extract* or *compute* new fields (`rex`, `eval`) versus commands that only *filter* or *transform* existing fields (`table`, `fields`, `convert`), leading candidates to mistakenly select `convert` or `fields` because they assume any command that modifies output can create fields.
Detailed technical explanation
How to think about this question
Under the hood, `rex` applies a PCRE (Perl Compatible Regular Expression) to each event's field value and populates a new field with the captured group. The `eval` command, on the other hand, uses expression-based functions (e.g., `eval newField = field1 + field2`) to compute a new field from existing fields, supporting arithmetic, string concatenation, and conditional logic. In real-world scenarios, `rex` is essential for parsing log lines with inconsistent formatting, while `eval` is ideal for calculated metrics like latency or status codes.
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 practitioner preparing for the SPLK-1002 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this SPLK-1002 question test?
Basic Searching and Transforming Commands — This question tests Basic Searching and Transforming Commands — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: rex — The `rex` command is correct because it uses regular expressions to extract new fields from existing field values. For example, `rex field=message "(?<newField>pattern)"` creates a new field named `newField` by matching a portion of the `message` field. This allows you to derive structured data from unstructured or semi-structured fields.
What should I do if I get this SPLK-1002 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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Last reviewed: Jun 30, 2026
This SPLK-1002 practice question is part of Courseiva's free Splunk certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SPLK-1002 exam.
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