Regex Tester

How to Use the Regex Tester

Enter a regular expression pattern in the top field and a test string in the text area below. The tool will automatically highlight all matches and display detailed information about each match, including captured groups.

Features

• Real-time Testing - See matches update instantly as you type your pattern or test string.
• Match Highlighting - Visualize matches directly in your test string with clear highlighting.
• Regex Flags Support - Toggle various regex flags like global, case-insensitive, multiline, and more.
• Capture Groups - View and analyze captured groups from your regular expressions.

Common Regex Patterns

Regex Flags Explained

• g
  Global search - find all matches rather than stopping after the first match.
• i
  Case-insensitive search - ignore differences between uppercase and lowercase letters.
• m
  Multiline mode - ^ and $ match the start/end of each line, not just the whole string.
• s
  Dot matches all - allows . to match newline characters.
• u
  Unicode support - treat pattern as a sequence of Unicode code points.
• y
  Sticky mode - match at the current position in the target string only.