@atlaskit/adf-schema/dist/es2019/utils/is-hex.js

Shared package that contains the ADF-schema (json) and ProseMirror node/mark specs

// eslint-disable-line import/no-namespace

const IS_HEX_REGEX = /^#([A-Fa-f0-9]{3}){1,2}$/u;
export function isHex(color) {
  return IS_HEX_REGEX.test(color);
}