Regex Tester

Test and debug your JavaScript regular expressions in real-time. Enter a pattern and test string to see immediate match highlighting and capturing group details.

How to Use

1. Enter Regex: Type your pattern in the input field. Do not include the forward slashes (e.g., use [a-z]+ instead of /[a-z]+/).
2. Select Flags: Toggle flags like Global (g), Case Insensitive (i), or Multiline (m).
3. Enter Test Text: Paste the text you want to test against.
4. View Matches: Matches will be highlighted instantly. Scroll down to see detailed information about captured groups.

Supported Flags

• g (global): Find all matches rather than stopping after the first match.
• i (insensitive): Case-insensitive search.
• m (multiline): The start and end characters (^ and $) work across multiple lines.
• s (dotAll): Allows . to match newline characters.
• u (unicode): Treat pattern as a sequence of Unicode code points.
• y (sticky): Matches only from the index indicated by the lastIndex property.

Common Patterns

• Email Address
  ^[^\s@]+@[^\s@]+\.[^\s@]+$
• URL / Website
  https?://[\w-]+(\.[\w-]+)+[/#?]?.*$
• Phone Number (US)
  ^\(?\d3\)?[-.]?\d3[-.]?\d4$
• Date (YYYY-MM-DD)
  ^\d4-\d2-\d2$