Regex Tester & Builder
Test, understand and build regular expressions instantly.
What is Pattern / Regex?
Text me se specific numbers, emails, ya words dhoondhne aur copy karne ka aasan tool.
How It Works
Test and build regex patterns in 3 easy steps
Enter Pattern & Flags
Type your regular expression pattern or select a pre-built template from popular presets.
View Live Highlights
Matches, index positions, and capture groups update in real-time as you type.
Export Code & Explain
Understand tokens in plain English and copy code for JS, Python, Java, PHP, Go, C#.
Frequently Asked Questions
Everything you need to know about Regular Expression Testing
What is a regular expression?
A regular expression (regex) is a sequence of characters that forms a search pattern. It is used to match, search, validate, or replace text strings in programming.
How do I test a regex?
Type or paste your regular expression in the Pattern box and enter your test string in the Test Text area. Matches will be highlighted live instantly.
What does regex g mean?
The 'g' flag stands for Global search. It tells the regex engine to find all matches in the text rather than stopping after the first match.
What does regex i mean?
The 'i' flag makes the pattern case-insensitive, matching uppercase and lowercase letters interchangeably.
How do capture groups work?
Parentheses () create capture groups that isolate specific parts of a match, allowing you to extract or reference substrings separately.
Can I test multiple strings?
Yes! Switch to the 'Test Cases' tab to add multiple test strings and verify pass/fail status simultaneously.
Can I generate regex code?
Yes! Click the 'Code Snippet' tab to generate ready-to-use regular expression code in JavaScript, TypeScript, Python, Java, PHP, C#, and Go.
Is my test data uploaded?
No. 100% of regex compilation and matching happens locally inside your browser. Your data is private and never sent to any server.