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1Introduction
The Regex Tester is an online debugging tool. Enter an expression and test text, and matching results are shown in real time so you can quickly verify whether your regex is correct. Whether matching, capturing, or replacing, the effects are visible directly. It supports both JavaScript and PCRE syntax, highlights matches, and lists the specific captured groups. The replace feature lets you preview the replaced text, and with common syntax hints you avoid flipping through documentation. It suits daily development scenarios like form validation, text extraction, and log parsing. Easy to use with instant feedback, it reduces repeated testing time so you can focus on the logic itself.
2How to Use
Enter the expression
Enter the regex to test in the expression box. You can quickly pick one from the syntax hints.
Add test text
Paste the text to match in the text area below. Matching results are highlighted in real time.
Check captures and replacements
Switch to the Groups or Replace tab to inspect the captured content and replacement output.
3FAQ
What regular expression syntax is supported?
Supports JavaScript and PCRE syntax, including character classes, quantifiers, grouping, backreferences, etc. You can choose different flavors in the options.
How to view detailed match information?
Match results are highlighted, and below, the start position of each match, group captures, etc., are listed to help you analyze in depth.
