Anchor a complete validation
See this course’s project requirements
A checked extraction script for fictional equipment tags, dates and log lines, with a mismatch report and exact-match safety boundaries.
Keep your working files in your own notebook or software. Save a private description, checklist, and work link in My Proof.
What to include
- A precise tag grammar with four checked cases.
- A segment-by-segment match explanation.
- A whole-input validation rule with a counterexample.
- An extracted log record with explicit string/number distinctions.
- A semantic date check separate from regex matching.
- A tested tag-and-log extraction tool with semantic limits.
Review and revise
Use these criteria to check your work and choose what to improve.
- The implementation or declared simulation follows the supplied contract and retains inspectable original inputs.
- Normal, boundary and rejected cases are recorded with expected versus observed results.
- The changed case has a correct explanation and does not rely on hidden state.
- The project includes source, outputs, instructions and honest tool, privacy and verification limits.
Want more background?
The idea in everyday life
For prefix EQ-007 suffix, TAG.search can find EQ-007, but TAG.fullmatch returns no match.
search finds a match anywhere; fullmatch requires the entire string to fit. A successful substring extraction should not be used as proof that the whole input is valid.
Anchor a complete validation — original worked practice
search finds a match anywhere; fullmatch requires the entire string to fit. A successful substring extraction should not be used as proof that the whole input is valid.
For prefix EQ-007 suffix, TAG.search can find EQ-007, but TAG.fullmatch returns no match.
1. Step 1
Run search against the decorated string.
You should see: A tag substring can be found.
This keeps the rule and its observable result together.
2. Step 2
Run fullmatch against the same string.
You should see: The extra prefix/suffix causes rejection.
This keeps the rule and its observable result together.
3. Step 3
Test bare EQ-007 with fullmatch.
You should see: It is accepted.
This keeps the rule and its observable result together.
4. Step 4
Record extraction and validation as different operations.
You should see: A whole-input validation rule with a counterexample.
This keeps the rule and its observable result together.
What to finish
A whole-input validation rule with a counterexample.
Watch for this
Using search to validate an entire identifier, allowing surrounding text to pass accidentally.
How can I tell I understand it?
Explain and demonstrate the required distinction: search finds a match anywhere; fullmatch requires the entire string to fit. A successful substring extraction should not be used as proof that the whole input is valid. Show a changed input and the expected result without weakening this contract.
Quick knowledge check
Answer all 3 questions. Get at least 2 right and the lesson completes automatically.
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Pass the check. We’ll save the progress.
Answer all 3 questions above and get at least 2 right. You can review the explanations and try again.
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Sources and further reading
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Source & access notes · checked 2026-10-01
Relevant documented module/API behavior inspected during expansion authoring; actual execution evidence is recorded separately. No grant eligibility is established.
Access: Official page retrieved with the web reader on 2026-10-01. Documentation reading does not certify execution in every native tool or browser.
Reuse: Original local practice files, fictional data, worked examples and questions. Concepts paraphrased and linked; source exercises are not copied.
Source & access notes · checked 2026-10-01
Relevant documented module/API behavior inspected during expansion authoring; actual execution evidence is recorded separately. No grant eligibility is established.
Access: Official page retrieved with the web reader on 2026-10-01. Documentation reading does not certify execution in every native tool or browser.
Reuse: Original local practice files, fictional data, worked examples and questions. Concepts paraphrased and linked; source exercises are not copied.
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