AI ToolsFree

AI Regex Generator

Describe what you want to match in plain English and Claude AI writes the correct regular expression. Includes explanation of each pattern component.

API Setup Required

AI tools need a backend API route to work. This prevents CORS errors from calling Anthropic directly from the browser.

Quick Setup (3 steps)

1

Create API route

app/api/ai/route.ts
2

Add your API key

.env.local → ANTHROPIC_API_KEY=sk-ant-...
3

Enable in component

AIToolBase.tsx → AI_ENABLED = true
app/api/ai/route.tsCopy & paste
import Anthropic from "@anthropic-ai/sdk";
import { NextRequest, NextResponse } from "next/server";

const client = new Anthropic({
  apiKey: process.env.ANTHROPIC_API_KEY,
});

export async function POST(req: NextRequest) {
  const { system, prompt } = await req.json();
  const msg = await client.messages.create({
    model: "claude-sonnet-4-20250514",
    max_tokens: 1024,
    system,
    messages: [{ role: "user", content: prompt }],
  });
  const text = msg.content[0].type === "text"
    ? msg.content[0].text : "";
  return NextResponse.json({ text });
}

Frequently Asked Questions

Does it explain the generated regex?▼
Yes. Every pattern comes with a plain-English breakdown of what each part does.
What regex flavour does it use?▼
JavaScript regex by default, with notes for differences in Python, PCRE, etc.