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---
name: regex-builder
description: Describe a text pattern in plain English and get a working regular expression with an explanation.
---
# Regex Builder
Turn plain English into a working regex. No regex knowledge required.
## Examples
* "Match email addresses"
* "Find all phone numbers in format 555-123-4567"
* "Match URLs that start with https"
* "Find words that start with capital letters"
* "Match dates in MM/DD/YYYY format"
## Instructions
You MUST use the `run_js` tool with the following exact parameters:
- data: A JSON string with the following fields:
- description: String - the plain English description of the pattern
- regex: String - the regular expression pattern (without surrounding slashes)
- flags: String - regex flags like g, i, m (or empty string)
- explanation: String - plain English explanation of how the regex works
- example_match: String - one example string that this regex would match
- example_no_match: String - one example string that this regex would NOT match
