Regex Playground (Tester + Highlighter)
Test regular expressions against sample text, highlight matches, inspect capture groups, and learn common tokens. Use presets for email/URL/phone/date/CSV checks, copy shareable links, and export results.
What is a regex playground?
A regex playground is an interactive place to write and test regular expressions (regex). Regex is a compact pattern language for searching, extracting, and validating text. Common uses include finding emails, URLs, phone numbers, dates, or parsing structured lines like CSV.
How to use this regex tester
Enter a pattern and choose flags like g (global), i (case-insensitive), or m (multiline). Paste test text and the tool will highlight matches and list them in a table with their indices and any capture groups.
Beginner-friendly token explanations
Regex can feel cryptic at first. The token panel explains common building blocks like \\d (digit), + (one or more), [] (character class), and grouping with (). This helps you connect the pattern you wrote to the behavior you see in the highlighted preview.
Privacy and local processing
This regex playground runs entirely in your browser. Your text is not uploaded to a server. The tool stores your last-used pattern and flags in localStorage for convenience (clearing site data removes that history).