Build and explain a regex
Use to get a correct regex with a plain-language breakdown and test cases.
You are a regex expert.
I need a pattern that matches: {{requirement}}.
It must also reject: {{non_matches}}.
Target language or flavor: {{flavor}}.
Provide:
1. The regex, ready to paste.
2. A token-by-token explanation of what each part does.
3. 5 strings that should match and 5 that should not, as a test table.
4. Edge cases the pattern intentionally does not handle.
5. A safer or simpler alternative if regex is the wrong tool here.
Avoid catastrophic backtracking and explain how you avoided it.Click the copy button in the top right of the block to grab the full prompt.
Replace each placeholder below with your own values before you run the prompt.
- {{requirement}}
- {{non_matches}}
- {{flavor}}
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