DEV Community: Rama Pandu Cheti

How I Use AI To Write Regex Without Memorizing Anything

Rama Pandu Cheti — Sun, 23 Nov 2025 05:00:55 +0000

Regular expressions are powerful… but let’s be honest — they’re a nightmare to remember.

Every time I need a regex, I end up doing one of these:

Googling: "regex for email validation"

Copy-pasting from StackOverflow

Re-testing it 10 times until it works

Still not understanding what it actually does

After years of frustration, I finally decided to fix this problem for myself.

So I built a simple AI-powered tool that converts plain English into a working regular expression — instantly.

No memorization. No RegEx cheat sheets. No headaches.

🧠 The Problem: Regex is Unnecessarily Hard

Regex is:

Cryptic (^\d{10}$)

Hard to debug

Easy to mess up

Difficult to read later

But 95% of the time, developers only need patterns for:

Email validation

Phone numbers

Dates

Password rules

IP addresses

URLs

So why are we still memorizing symbols instead of describing what we want?

✅ The Solution: Plain English → Regex

Now, instead of writing this:

^+?[1-9][0-9]{7,14}$

I just type:

"regex for valid Indian mobile number"

And the tool gives me:

✅ The regex
✅ An explanation
✅ Example matches

You can try it here (free, no signup):
👉 https://dev-brains-ai.com/regex-generator

🧪 Real Examples

Here are real inputs that work beautifully:

Plain English Input What I Get
regex for email validation Full email regex
match date in DD-MM-YYYY Date pattern
exactly 4 digits PIN code pattern
IPv4 address format IP regex
strong password with symbol Password validator

Instead of memorizing patterns, I just describe my requirement naturally.

💡 Why This Saves Me Time

This small change saves me:

✅ 10–15 mins of Googling every time
✅ Countless StackOverflow visits
✅ Trial and error testing
✅ Mental energy

It also helps juniors & non-regex developers on my team.

🔐 Privacy First

Everything runs in the browser.
No prompts are stored.
No signup required.

You can use it as often as you need.

Try it here:
👉 https://dev-brains-ai.com/regex-generator

🚀 What’s Next?

I’m building more AI-powered dev tools like:

SQL Generator

Error Message Explainer

JSON Formatter

Schema Generator

You can explore all of them here:
👉 https://dev-brains-ai.com

🙋 I’d Love Your Feedback

If you use regex often, I’d love to know:

What’s the most annoying regex you’ve had to write recently?

Drop it in the comments and I’ll test it in the tool for you 👇

How I built a free AI Regex Generator using Hugging Face + Next.js (no API costs)

Rama Pandu Cheti — Mon, 10 Nov 2025 17:18:16 +0000

🚀 Intro

For years, I’ve hated writing regex 😅 — every time I needed to validate an email or extract a substring, I ended up Googling and testing patterns endlessly.

So, I built Dev Brains AI
— a free collection of small AI tools that help developers generate regex and SQL queries instantly using open models from Hugging Face.

No API keys. No OpenAI costs. Just fast, simple AI utilities.

🧩 The Tech Stack

Here’s the exact stack behind the project:

Layer Tech
Frontend Next.js 14, Tailwind CSS
Backend Serverless API routes
AI inference Hugging Face open models (google/flan-t5-small)
Deployment Vercel
Auth/DB None — fully static
Monetization Google AdSense (planned)
🧠 How the AI works (Hugging Face API)

Instead of using GPT or paid APIs, I wanted to make this fully free.

Here’s how the inference request works:

import { HfInference } from "@huggingface/inference";

const client = new HfInference(process.env.HF_TOKEN);

export async function generateRegex(prompt) {
const result = await client.textGeneration({
model: "google/flan-t5-small",
inputs: Generate a regex for: ${prompt},
parameters: { max_new_tokens: 60 },
});

return result.generated_text;
}

This simple call hits the Hugging Face inference router, returning a lightweight model output — perfect for quick tasks like regex or SQL generation.

⚙️ The Next.js API route

Each AI call runs through a serverless API endpoint to hide the API key:

// pages/api/regex.js
import { HfInference } from "@huggingface/inference";

const client = new HfInference(process.env.HF_TOKEN);

export default async function handler(req, res) {
const { prompt } = JSON.parse(req.body);

try {
const output = await client.textGeneration({
model: "google/flan-t5-small",
inputs: Generate a regex for: ${prompt},
parameters: { max_new_tokens: 60 },
});

res.status(200).json({ result: output.generated_text });

} catch (err) {
res.status(500).json({ error: err.message });
}
}

Simple, secure, and free to deploy.

🎨 The UI

I used Tailwind CSS for fast prototyping and clean visuals.

AI Regex Generator

Generate Regex

Minimal, responsive, and instantly loads on mobile too.

⚡ Deployment

The whole site runs on Vercel’s free plan.
Build command:

npm run build

Output directory:

.next

Once connected to GitHub, every push automatically redeploys.
Vercel also handles HTTPS + caching automatically.

💡 Lessons learned

Small models are surprisingly good for structured tasks like regex or SQL.

SSR is your friend — pre-render content for faster Google indexing.

No API cost = real scalability for free projects.

Focus on value-first UI — users love tools that “just work.”

🔮 What’s next

I’m adding:

JSON formatter + beautifier with AI explanations

Code comment generator

AI-based log analyzer

👉 You can try it here: https://dev-brains-ai.com

❤️ If you’d like to build similar tools

If you’re interested, I can publish a tutorial repo showing:

Full Next.js setup

Hugging Face integration

SEO + AdSense-ready deployment on Vercel

Let me know in the comments 👇

TL;DR:
Built an AI Regex Generator using free Hugging Face models + Next.js
→ Runs fast, costs $0/month, and is deployed on Vercel.
👉 Try it live

I built a free AI Regex & SQL Generator to save developers time (no login, open models)

Rama Pandu Cheti — Mon, 10 Nov 2025 17:15:28 +0000

🚀 Why I built this

Like most developers, I’ve spent way too much time searching for that one regex pattern that works.
And writing SQL queries from scratch every time can get repetitive too.

So, I decided to create a simple, AI-powered developer tool that can do both — instantly.

👉 Dev Brains AI

It’s a collection of free AI tools that help developers save time on everyday coding tasks.

🧩 Current tools on the site
🔹 AI Regex Generator

Describe what you want — and it writes the regex (with explanation).

Examples:

“match a valid email address”

“extract numbers from a string”

“check if string starts with ‘abc’”

Result → regex + human-readable explanation.

Try it here:
➡️ https://dev-brains-ai.com/regex-generator

🔹 AI SQL Query Generator

Write your query in plain English, and it outputs real SQL instantly.

Examples:

“Select top 5 users by revenue”

“Find all orders from last 30 days”

It supports MySQL, PostgreSQL, and SQLite-like syntax.

Try it here:
➡️ https://dev-brains-ai.com/sql-generator

🧠 How it works

I used:

Next.js + TailwindCSS for the UI

Open-source AI models from Hugging Face (no paid API keys)

Node.js serverless functions for generation

Deployed on Vercel (super fast and free)

Each request uses a small, open model that runs under 2 seconds, so you get results instantly.

💡 What’s next

I’m working on adding:

🧾 JSON formatter with AI explanations

🪄 Code comment generator

⚙️ Log pattern detector for DevOps users

If you have ideas for more tools, I’d love to hear them in the comments.

⚡ TL;DR

Free AI-powered Regex & SQL Generators

No signups, no limits

Uses open models (not OpenAI API)

Fast and ad-supported

🔗 Try it out — Dev Brains AI

❤️ Feedback welcome

If you test it, I’d really appreciate your feedback on:

Accuracy of regex/SQL outputs

UI/UX experience

What AI tools you’d find most useful next

📬 Want to build similar tools?

If anyone’s curious about the tech stack or Hugging Face integration, I can share a tutorial on setting up AI inference endpoints in a free-tier Next.js app.

That’s it — hope you find it useful!

Happy coding 💻
— Rama (dev-brains-ai.com)