Core regex flags explained
/g (global match: finds all matches rather than stopping after the first), /i (case-insensitive), /m (multiline: ^ and $ match start/end of line), /s (dotAll: . matches newlines).
Common regex pattern cheat sheet
Email: ^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$; URL: https?:\/\/[\w\-\.]+\.[a-z]{2,}; Phone: ^\+?[1-9]\d{1,14}$; Numbers only: ^\d+$.
Getting a trustworthy result
Regex Live Tester & Group Matcher runs entirely in your browser from the numbers you enter. Check the methodology notes above, then compare with a related calculator or a short guide if you want a second pass before you decide.
What to do next
If prices or rates sparked this visit, glance at Markets. If you want a walkthrough, open a related guide. Or switch to another calculator in the same category to finish the task in one sitting.
FAQ
How do capture groups work in regex?
Parentheses (like `(\d{4})-(\d{2})`) capture matched sub-strings into indexed groups for easy extraction.
Why is my regex returning only one match?
Ensure the Global (/g) flag is active so the regex engine continues searching through the entire input string.
Is the Regex Live Tester & Group Matcher free?
Yes. It runs in your browser with no account required.
Where should I go after using this tool?
Try related tools in the sidebar, Markets for live-style price snapshots, or Blog guides that link back into calculators.