github-pages-deploy-action/node_modules/@octokit/endpoint/dist-src/util/extract-url-variable-names.js

const urlVariableRegex = /\{[^}]+\}/g;
function removeNonChars(variableName) {
    return variableName.replace(/^\W+|\W+$/g, "").split(/,/);
}
export function extractUrlVariableNames(url) {
    const matches = url.match(urlVariableRegex);
    if (!matches) {
        return [];
    }
    return matches.map(removeNonChars).reduce((a, b) => a.concat(b), []);
}