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An online regex tester designed for Go developers. Validate RE2 syntax rules and view match results and capture groups in real-time.
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Enter both a regex pattern and input text
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When writing regular expressions in Go code, do you worry about syntax errors or unexpected match results? This tool is designed specifically to solve the pain points of debugging Go regular expressions. Based on the RE2 engine of the Go standard library's regexp package, it validates the matching effect of your regex pattern against specific text in real-time. A regular expression is a text pattern used to describe string matching rules. This tool outputs all matches, capture group contents, and their exact positions in the text.
(\d{3})-(\w+)Phone 123-abc, ID 456-defQ: What is the difference between Go regex and regex in other languages?
A: Go uses the RE2 engine, which does not support PCRE features like backreferences and zero-width assertions, but guarantees safe linear-time matching.
Q: How do I match multiline text?
A: Add the (?m) flag before the pattern. For example, (?m)^hello matches "hello" at the beginning of each line.
The input text should not be too large, as complex patterns may affect performance. This tool does not store any input data, but you should avoid testing sensitive information. RE2 does not support advanced features like backreferences, so pay attention to syntax limitations.
For Go developers, it is recommended to prioritize using regexp.Compile over MustCompile to handle compilation errors gracefully. Typical example: The pattern go([0-9]+) against the text go123 golang outputs the full match "go123" and the capture group "123". The deterministic matching characteristic of RE2 makes it particularly suitable for processing user-inputted regular expressions, avoiding the risk of ReDoS attacks.