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Read and repair a regular expression: anchoring, catastrophic backtracking, and the character class that quietly matches a newline.
Passed 20 of 22 test cases with the skill, and 20 of 22 without it.
1 fixed19 passed either way1 still failing1 broke
Tokens, turns and time describe resource use, not a dollar price.
A test case the skill fixed. Same model, same prompt, with and without the skill.
The pattern `^([^"]|\\")*$` hangs when parsing unclosed double quotes like `"abcdefghijklmnopqrstuvwxyz...`. Rewrite using an unrolled loop pattern.
| Checked | Without skill | With skill |
|---|---|---|
| Uses unrolled pattern `^[^"\\]*(?:\\.[^"\\]*)*$` | Missed | Passed |
The instructions your model reads when the skill loads.
Read and repair a regular expression: anchoring, catastrophic backtracking, and the character class that quietly matches a newline.
test cases passed, vs 20 / 22 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.