Master regular expressions with our interactive tester. See matches highlighted instantly as you type your pattern and test string.
A regex tester lets you enter a regular expression and sample text to see which parts match.
Enter the pattern, provide test text, and inspect matches, groups, captures, and flags supported by the tool.
Regex syntax differs between engines such as JavaScript, Python, PCRE, .NET, and others, so test against the same engine you will use in production.
Common debugging steps are to simplify the pattern, test a smaller string, inspect escaping, and check flags such as case-insensitive or multiline mode.
Use a tester to develop and validate patterns before embedding them in code.
Results may differ from your programming environment if the tester uses a different regex engine, Unicode rules, or flags.
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