Reference notes
How regex testing works
Regex testing applies a pattern to sample text and reports whether it matches.
Useful output should show match spans, captured groups, and errors in the pattern syntax.
Regex tester examples
The pattern ^[0-9]+$ matches a string made only of digits.
Examples should show both matching input and near misses so users can understand anchors, character classes, and quantifiers.
Regex tester FAQ
Regular expression behavior can differ between engines. A pattern for JavaScript may not behave exactly the same in Java, PCRE, or Python.
Complex patterns should be tested with representative input, including empty and boundary cases.
Regex tester references
Reference material should cover anchors, groups, alternation, character classes, and quantifiers.
Future references can call out engine-specific behavior.
Regex tester developer examples
Developer examples should show validating simple formats and extracting captured groups.
Examples should mention performance risks from overly broad or nested patterns.