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Frequently Asked Questions
An online regex tester lets you write a regular expression pattern and instantly test it against sample text to see all matches, match count, and whether the pattern is valid.
The tool supports three flags: I (Case Insensitive — matches upper and lower case equally), M (Multiline — ^ and $ match the start/end of each line), and S (Singleline — the dot . also matches newline characters).
Match count shows the total number of non-overlapping occurrences of your pattern found in the test string.
With the I flag enabled, the pattern treats uppercase and lowercase letters as identical, so a pattern like 'hello' would match HELLO, Hello, and hello.
The M flag changes ^ and $ anchors so they match the beginning and end of each individual line rather than the entire input string — useful for line-by-line pattern matching.
Yes. Your regex pattern and test string are processed securely on our server. No data is stored, logged, or shared — results are returned instantly and discarded.