Regex Builder Online
Regex Builder Online
By
Build and test regular expressions from sample text with clear pattern guidance. Get accurate regex, component breakdowns, and live match results in one place.
Chrome Store Rating
PRODUCT HUNT#1 Product of the Week
Build Regex Patterns Faster OnlineCreate and test regular expressions with a simple interface, sample text, and pattern options. Save time while you refine matches with clear feedback.
Install fromChrome Web Store
Build Regex Patterns Faster Online
Need to match emails, phone formats, or custom text patterns? Thunderbit can help you scrape examples from websites, PDFs, docs, and images, then structure and format the data for easy use.
Extract information from subpages and paginated sites, summarize or categorize the results, and export everything to Google Sheets, Airtable, or Notion with no code required.
How to Build Regex Using Thunderbit
STEP 1Download and InstallDownload and install the Thunderbit Chrome Extension from the Thunderbit Chrome Extension Download Page. Once installed, log in or create a free account to get started.
STEP 2Open ExtensionOpen the Regex Builder Online page in your browser, then launch the Thunderbit extension. Choose the Build Regex from Sample Text tab, enter your sample text, describe the matching criteria, and select any optional flags such as global or case-insensitive.
STEP 3Click the Generate Regex ButtonClick the Generate Regex button. Thunderbit will create a regex pattern based on your sample text and matching criteria, then show a breakdown of the pattern and the matches found in the sample text. Review the result and copy the regex into your workflow or testing tool.
Learn how to build and test regex patterns
Build Regex from Sample Text
Paste sample text and describe what you want to match, such as emails, phone numbers, dates, or custom word formats. The tool then generates a regular expression based on your criteria, which helps remove the guesswork from pattern writing. It is useful for developers, analysts, and anyone who needs to work with text rules without manually assembling complex syntax.
Test Regex with Live Match Highlights
After generating a pattern, you can test it against your sample text and see which parts match in real time. This makes it easier to verify accuracy, catch edge cases, and refine the pattern before using it in code or automation. The breakdown of regex components also helps users understand why a pattern works, making it a good learning aid for beginners.
Apply Regex Flags for Better Control
You can choose common regex flags such as global, case-insensitive, multiline, dotall, and unicode to shape how the pattern behaves. This makes the output more practical for different text formats and search needs. By adjusting flags before generating the result, users can produce a pattern that is better suited for logs, forms, scraped text, or structured documents.
Understand Regex Components Clearly
The tool returns a concise explanation of the generated pattern, including the role of each part. That makes it easier to learn regex while solving real tasks, instead of treating patterns as a black box. This is especially helpful for teams that need to maintain scripts, validate data, or share patterns with others in a readable format.
Discover More Scraper Tools
Amazon Products Scraper
Extract product details from Amazon by pasting product URLs. Get titles, prices, ratings, and more in a structured table for quick export and review.
AI Sales Email Generator
Create personalized sales emails in seconds with the free AI Sales Email Generator. Perfect for sales teams and entrepreneurs. Try it now and boost your outreach with Thunderbit’s suite of AI tools.
Image to Excel Converter
Convert images of tables, receipts, or lists into structured JSON arrays for easy export to Excel. Save time on manual data entry and ensure accuracy.
Email Extractor
Find and extract email addresses with Email Extractor from webpages, PDFs, or text. Fast, accurate, and ready to export anytime.
Amazon Review Exporter
Extract detailed Amazon product reviews by pasting a product URL. Instantly collect reviewer info, ratings, and more in a structured table for easy analysis.
Product Details Scraper
Scrape product details from eCommerce sites like Amazon, Walmart, Shein, Lazada, and Zalando. Collect name, brand, price, images, ratings, and reviews in structured format for quick analysis or export.
Find More Tools Now
What users say about Thunderbit
Taryn W.Growth Strategist@Thunderbit changed how I run competitor research. I click 'AI Suggest Fields,' and it builds a clean table across paginated results—no coding, no CSS. Huge time-saver when analyzing product data from long-tail marketplaces.
Miles T.Sales Development ConsultantI use Thunderbit to grab emails and phone numbers from directories. It extracts clean contact info in one click, and exporting to Sheets or Notion takes seconds. No extra setup, no coding—just usable data ready to work with.
Rhea C.E-commerce AnalystThunderbit helps me monitor SKU data across multiple pages. I scrape the listings, then use Subpage Scraping to pull full product specs, pricing, reviews, and stock. The AI organizes everything into columns I define.
Cassian B.Real Estate AdvisorThunderbit's Scheduled Scraper makes real estate tracking easier. I describe the interval in plain English, and it automatically pulls updated listings, prices, and links without touching the setup again. Simple and very practical.
Dorian B.Content & SEO SpecialistI use Thunderbit's Field AI Prompts to clean and tag scraped blog content. It extracts titles, authors, and even suggests categories. Works great across dynamic sites and subpages—perfect for building structured SEO datasets.
Lina K.Marketplace Operations LeadWe track SKUs from niche stores using Thunderbit. Cloud Scraping handles 50 pages at a time, and for login-required sites, we switch to browser mode. It’s fast, flexible, and doesn’t need ongoing maintenance or manual edits.
Jorge F.Inbound Sales ManagerThunderbit’s AI Autofill is a lifesaver. After scraping contact info, I use it to fill lead forms directly in my browser. I just select the tab, and it fills everything using the scraped row. No manual input needed.
Alina D.Freelance ResearcherI rely on Thunderbit for extracting data from PDFs, image-based sites, and infinite scroll pages. It handles messy formats with AI and delivers ready-to-export tables I can send to Google Sheets or Airtable in seconds.
Taryn W.Growth Strategist@Thunderbit changed how I run competitor research. I click 'AI Suggest Fields,' and it builds a clean table across paginated results—no coding, no CSS. Huge time-saver when analyzing product data from long-tail marketplaces.
Miles T.Sales Development ConsultantI use Thunderbit to grab emails and phone numbers from directories. It extracts clean contact info in one click, and exporting to Sheets or Notion takes seconds. No extra setup, no coding—just usable data ready to work with.
Rhea C.E-commerce AnalystThunderbit helps me monitor SKU data across multiple pages. I scrape the listings, then use Subpage Scraping to pull full product specs, pricing, reviews, and stock. The AI organizes everything into columns I define.
Cassian B.Real Estate AdvisorThunderbit's Scheduled Scraper makes real estate tracking easier. I describe the interval in plain English, and it automatically pulls updated listings, prices, and links without touching the setup again. Simple and very practical.
Dorian B.Content & SEO SpecialistI use Thunderbit's Field AI Prompts to clean and tag scraped blog content. It extracts titles, authors, and even suggests categories. Works great across dynamic sites and subpages—perfect for building structured SEO datasets.
Lina K.Marketplace Operations LeadWe track SKUs from niche stores using Thunderbit. Cloud Scraping handles 50 pages at a time, and for login-required sites, we switch to browser mode. It’s fast, flexible, and doesn’t need ongoing maintenance or manual edits.
Jorge F.Inbound Sales ManagerThunderbit’s AI Autofill is a lifesaver. After scraping contact info, I use it to fill lead forms directly in my browser. I just select the tab, and it fills everything using the scraped row. No manual input needed.
Alina D.Freelance ResearcherI rely on Thunderbit for extracting data from PDFs, image-based sites, and infinite scroll pages. It handles messy formats with AI and delivers ready-to-export tables I can send to Google Sheets or Airtable in seconds.
Frequently Asked Questions
Extract Data using AI
Easily transfer data to Google Sheets, Airtable, or Notion
Chrome Store Rating
PRODUCT HUNT#1 Product of the Week