/**
 * Resolve the specified attribute from token info
 */
export const resolveAttr = (info, attr) => {
    // try to match specified attr mark
    const pattern = `\\b${attr}\\s*=\\s*(?<quote>['"])(?<content>.+?)\\k<quote>(\\s|$)`;
    const regex = new RegExp(pattern, 'i');
    const match = info.match(regex);
    // return content if matched, null if not specified
    return match?.groups?.content ?? null;
};