# regex101

> website for building, testing, and debugging regex

**Wikidata**: [Q108853613](https://www.wikidata.org/wiki/Q108853613)  
**Source**: https://4ort.xyz/entity/regex101

## Summary
regex101 is a proprietary website designed for building, testing, and debugging regular expressions (regex). Launched on August 15, 2012, it serves as an online editing tool that supports multiple languages. The platform provides a dedicated environment for users to validate and troubleshoot regex patterns directly in their web browser.

## Key Facts
- **Inception:** The website was created on August 15, 2012.
- **Primary Function:** It is utilized for editing, building, testing, and debugging regular expressions.
- **Entity Type:** It is classified as a website.
- **URL:** The official site is accessible at https://regex101.com/.
- **License:** The platform operates under a proprietary license.
- **Copyright Status:** The content and software are copyrighted.
- **Alias:** The entity is also known by its domain name, regex101.com.
- **Social Presence:** The associated Twitter account (@regex101) was established on December 23, 2011.
- **Language Support:** The website is available in English, with the work supporting multiple languages.

## FAQs
### Q: What is the primary purpose of regex101?
A: regex101 is a website used specifically for building, testing, and debugging regular expressions. It functions as an editing tool to help users validate regex patterns.

### Q: When was regex101 created?
A: The website regex101.com was inceptioned on August 15, 2012. Its associated Twitter account was created slightly earlier, on December 23, 2011.

### Q: Is regex101 free to use?
A: The source material classifies regex101 as operating under a "proprietary license" with a status of "copyrighted." It is a web-based service served from a single domain.

## Why It Matters
regex101 addresses a specific and often complex need in software development and data processing: the creation and validation of regular expressions. Regular expressions are a powerful but notoriously difficult tool to master; regex101 provides a dedicated environment to simplify this process. By offering a specialized interface for editing and debugging, the platform helps developers ensure their patterns match intended text strings accurately before deploying them in production code.

As a web-based tool, it removes the need for local installation, providing immediate access to a testing ground for anyone working with text parsing. Its longevity—having been operational since 2012—highlights its sustained relevance in the developer community. By centralizing the building and testing phases, it reduces syntax errors and logic mistakes, serving as a critical utility for programmers, data scientists, and system administrators who rely on precise text manipulation.

## Notable For
- **Specialized Utility:** Distinctly focused on a single main subject: regular expressions.
- **Operational Longevity:** Has served the developer community since its inception in 2012.
- **Integrated Toolset:** Combines building, testing, and debugging capabilities in one online interface.
- **Multilingual Support:** Designed to support multiple languages for its users.

## Body

### Purpose and Functionality
regex101 is an instance of a website dedicated to the main subject of regular expressions. Its primary use cases are defined as editing, building, testing, and debugging regex syntax. The platform operates as a specialized code editor that allows users to input regex patterns and test them against sample text in real-time.

### History and Timeline
The domain and website were officially inceptioned on August 15, 2012. Prior to the website's launch, a social media presence was established via the Twitter handle @regex101 (ID: 444908257) on December 23, 2011. The site has been active for over a decade, serving as a resource for the programming community.

### Technical Specifications
The service is accessible via the URL `https://regex101.com/`. It is classified as a copyrighted website operating under a proprietary license. While the website interface is in English, the "language of work or name" property indicates support for multiple languages, suggesting accessibility for a global user base.

## References

1. [Source](https://www.whois.com/whois/regex101.com)
2. [regex101: build, test, and debug regex](https://regex101.com/)
3. [(19) regex101 (@regex101) / Twitter](https://twitter.com/regex101)