Solve a task with regex
Each guide includes input, a pattern, expected results, and the steps to use them in regex101.
| Task | Finished result | Prerequisites |
|---|---|---|
| Extract order IDs from logs | Two IDs, regression tests, generated code, and a saved workspace | JavaScript matching and extraction, included in Free |
| Clean a text file in two steps | A saved pipeline and the completed text file | Free sequential substitutions, or a Pro pipeline |
| Test several cases | Positive, negative, and boundary expectations | Unit tests, included in Free |
| Investigate performance | Comparable measurements with stated limits | Pro benchmarks or a target-runtime script |
| Classify order identifiers | A format check that rejects incomplete and extended values | JavaScript matching, included in Free |
If regex101 is new to you, the first-match walkthrough introduces the pattern field, input, flavor, and results. If a pattern already works in regex101 but fails elsewhere, start with runtime differences.