Regex Tester
Test, validate, and debug regular expressions instantly. See matches, capture groups, and named groups highlighted in real time as you type.
Fast. Local. Effortless.
Manage your sensitive files with zero uploads. Everything happens directly in your browser.
Enter a Pattern
Type your regular expression into the pattern field and set flags like global, case-insensitive, and multiline.
Paste Your Test String
Add any text to the test string area. Matches are highlighted live as you type — no submit button needed.
Inspect Results
Explore every match, its index, capture groups, and named groups in the collapsible match inspector.
Specialized Workflows & Use Cases
Tailored browser-based workflows designed for specific industry needs and compliance standards.
Online Regex Tester for Lawyers
Regex Tester for Lawyers - private & secure online processing in your browser. Zero server uploads, no limits.
100 Percent Local Regex Tester for Lawyers
Regex Tester for Lawyers - private & secure 100 percent local processing in your browser. Zero server uploads, no limits.
Browser Based Regex Tester for Lawyers
Regex Tester for Lawyers - private & secure browser based processing in your browser. Zero server uploads, no limits.
No Server Upload Regex Tester for Lawyers
Regex Tester for Lawyers - private & secure no server upload processing in your browser. Zero server uploads, no limits.
Secure Regex Tester for Lawyers
Regex Tester for Lawyers - private & secure secure processing in your browser. Zero server uploads, no limits.
Online Regex Tester for Accountants
Regex Tester for Accountants - private & secure online processing in your browser. Zero server uploads, no limits.
100 Percent Local Regex Tester for Accountants
Regex Tester for Accountants - private & secure 100 percent local processing in your browser. Zero server uploads, no limits.
Browser Based Regex Tester for Accountants
Regex Tester for Accountants - private & secure browser based processing in your browser. Zero server uploads, no limits.
Real-Time Matching
100% Private — Runs in Your Browser
Frequently Asked Questions
Everything you need to know about our private, browser-based file tools.
Still have questions? Contact us or check our How it Works page.
What Is a Regex Tester?
A regular expression (regex) is a sequence of characters that defines a search pattern. Developers use regex for input validation (email formats, phone numbers), text extraction (parsing log files, scraping data), find-and-replace operations, and routing rules. Writing regex correctly is notoriously tricky — a single misplaced character changes the pattern entirely. A regex tester lets you write, test, and iterate on patterns in real time against sample text.
Features of Edita's Regex Tester
- Real-time matching. Results update instantly as you type — no button to press.
- Match highlighting. All matches are highlighted inline in the test string so you see exactly what your pattern captures.
- Flag support. Toggle global (g), case-insensitive (i), multiline (m), and dotAll (s) flags.
- Match count and groups. See how many matches were found and inspect capture groups.
- Runs locally. Your test strings — which may contain sensitive log data or user input — never leave your browser.
Common Use Cases
Form Validation
Build and test patterns for email addresses, phone numbers, postal codes, and password requirements before embedding them in production code.
Log File Analysis
Paste a server log excerpt and write a pattern that extracts IP addresses, timestamps, or error codes — verifying the pattern captures exactly what you need before running it on a 10 GB log file.
Data Extraction & Scraping
Test patterns for extracting structured data from unstructured text — URLs, prices, product codes, dates — before integrating them into a script.
Related Tools
Combine regex skills with the JSON Formatter to validate and clean API data, or the Base64 Converter for encoding extracted strings.