Regex Pattern Builder & Interactive Explainer

import { GoogleGenAI } from '@google/genai';

const ai = new GoogleGenAI({ apiKey: process.env.GEMINI_API_KEY });

async function runPrompt(variables: Record<string, string>) {
  let promptText = `Create a regular expression based on the following pattern matching requirements.

Requirements: {{matching_requirements}}
Engine/Language: {{regex_flavor}}
Sample Test String: {{sample_string}}

Output:
- Regular Expression Pattern
- Explanation of each token`;
  Object.entries(variables).forEach(([key, val]) => {
    promptText = promptText.replace(new RegExp(`{{\\s*${key}\\s*}}`, 'g'), val);
  });

  const response = await ai.models.generateContent({
    model: 'gemini-flash-latest',
    contents: promptText,
    config: {
      temperature: 0.7,
      systemInstruction: `You are a developer tools expert specializing in cross-language regular expressions.`,
    },
  });

  return response.text;
}