Regex Editor & Tester
Build, test, and debug regular expressions
Build, test, and debug regular expressions
Validates CSS rgb() and rgba() color values in both modern space-separated syntax (with optional slash alpha) and legacy comma-separated syntax. Supports integer (0-255) and percentage values for channels, and alpha as percentage, 1, 0, or decimal (e.g., 0.5). Useful for form validation, CSS parsers, or code linting tools.