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PROMPT SPACE
R
$12.00designUniversal

regex-builder

Convert plain English into tested regex patterns and explain existing ones across multiple language flavors.

skill install https://www.promptspace.in/skills/regex-builder

What it does

The Regex Builder is a dual-mode utility designed to eliminate the frustration of working with regular expressions. It functions as both a generator and a translator: it can convert complex natural language requirements into optimized regex patterns, or take an existing arcane regex string and break it down into a human-readable explanation.

How it works

For developers building new features, the skill parses intent (data type, constraints, and context) to construct patterns tailored to specific language flavors including JavaScript, Python, Go, Rust, and PHP. In reverse, the "Explain Mode" performs a token-by-token analysis of any provided regex to reveal exactly what it matches and where it might fail.

Why use this skill

Unlike general-purpose AI prompting, this skill follows a structured architectural process: it accounts for engine-specific limitations (like RE2's lack of lookarounds), provides validated test cases (3 matches, 2 non-matches), and generates ready-to-run code snippets. It ensures your patterns are not just syntactically correct, but also optimized for your specific programming environment.

Output format

  • Flavor-Specific Patterns: Correct syntax for your chosen language engine.
  • Logical Breakdowns: Token-by-token explanations of what every metacharacter does.
  • Unit Tests: Concrete examples of strings that will and will not match.
  • Implementation Code: Boilerplate snippets for immediate integration.

Use cases

  • Generate flavor-specific regex for JS, Python, Go, Rust, and PHP.
  • Translate complex legacy regex patterns into plain English explanations.
  • Verify patterns with 5 automatically generated match/no-match test cases.
  • Produce ready-to-use boilerplate code for pattern implementation.

Example

Prompt

Create a regex for US phone numbers in Python and explain how it works.

Sample output preview is available after purchase.

Frequently asked questions

Regex Builder eliminates the need for manual trial-and-error by converting natural language into optimized patterns and providing 'Explain Mode' to simplify complex, pre-existing expressions. It solves the common issue of syntax errors and language-specific inconsistencies when writing regex.