Regex prompt

What most people type

regex for US phone numbers

It works, but the AI has to guess your language or regex flavor and whole string or find within text, so the first answer usually needs another round. The version below asks for exactly what a professional would deliver.

Write a regex that matches US phone numbers. Accept common formats such as 5551234567, 555-123-4567, (555) 123-4567, 555.123.4567 and +1 555 123 4567. Regex flavor: [language or regex flavor]. Match against: [whole string or find within text]. Give the regex in a code block, then 1-2 lines explaining how it works and what it won't match. Add a few example strings that match and a few that don't.

Replace the [brackets] with your details before you send it: language or regex flavor, whole string or find within text.

What a professional regex prompt covers

• Formats to accept placeholder or common formats
• Language or engine placeholder
• Test examples

Best AI model for this prompt

This is a everyday task. You don't need the most expensive model. The cheapest model at each company that handles it well:

Pay-per-use list prices for this prompt and its expected answer (about 400 tokens). On a monthly chat plan, the same choice shows up as more messages before you hit your limit. See today's AI prices.