Webflags: gi

CSS rgb() Color

Match CSS rgb() and rgba() color functions, including an optional alpha channel.

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Available in

JSSupported

JavaScript / ECMAScript

Browser-native RegExp. Default if you don't pick.

PYSupported

Python (re)

CPython stdlib `re`. Unicode-aware `\w` and `\d` by default.

GOSupported

Go (RE2)

Linear-time matching. No backreferences or lookarounds.

Pattern

regexengine-agnostic
rgba?\(\s*\d{1,3}\s*,\s*\d{1,3}\s*,\s*\d{1,3}(?:\s*,\s*(?:0|1|0?\.\d+))?\s*\)   (flags: gi)

Raw source: rgba?\(\s*\d{1,3}\s*,\s*\d{1,3}\s*,\s*\d{1,3}(?:\s*,\s*(?:0|1|0?\.\d+))?\s*\)

How it works

Matches rgb( or rgba( followed by three comma-separated 1–3 digit components and an optional fourth alpha component (0, 1, or decimal).

Examples

Input

rgb(255, 87, 51)

Matches

  • rgb(255, 87, 51)

Input

rgba(0, 0, 0, 0.5)

Matches

  • rgba(0, 0, 0, 0.5)

Input

color: blue;

No match

—

Common use cases

  • •Stylesheet color extraction
  • •Design token migration
  • •Theme color auditing
  • •CSS-in-JS transform tooling

Related patterns

CSS hsl() / hsla() Color

Web

Match CSS hsl() and hsla() color functions, capturing hue (0–360), saturation, lightness, and optional alpha.

Hex Color Code

Web

Match CSS hex color codes in both 3-digit (#RGB) and 6-digit (#RRGGBB) formats.

CSS Custom Property (Variable)

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Match CSS custom properties (variables) like `--brand-color` or `--font-size-lg`.

HTML5 Color Input Value

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Validate the value of an HTML5 `<input type="color">` — exactly 6 hex digits with leading hash.

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