How to Use
- 1
Enter your regular expression in the pattern field at the top. Use the flag checkboxes to toggle global (g), case-insensitive (i), multiline (m), and other flags.
- 2
Type or paste your test string in the input box below. Matches are highlighted in real time.
- 3
Review the match details panel to see each match, its position, and any captured groups.
Frequently Asked Questions
What regex flavors are supported? ▼
This tool uses JavaScript regular expressions, which support flags: global (g) for all matches, case-insensitive (i), multiline (m) to treat ^ and $ as line boundaries, dotall (s) to make . match newlines, and unicode (u) for full Unicode support.
Does this tool support named capture groups? ▼
Yes. JavaScript named capture groups using the (?<name>...) syntax are fully supported and their values are displayed in the match details panel.
How do I match across multiple lines? ▼
Use the multiline flag (m) to make ^ and $ match the start and end of each line instead of the entire string. Use the dotall flag (s) to make the . character match newline characters as well as everything else.
What is a capture group? ▼
Capture groups let you extract specific parts of a match. Use parentheses: (\d+) captures one or more digits. Named groups use (?<name>\d+) syntax for clearer references. Non-capturing groups use (?:...) when you want to group without capturing.