@aws-sdk/config-resolver/dist-es/regionInfo/getResolvedSigningRegion.js

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export const getResolvedSigningRegion = (hostname, { signingRegion, regionRegex, useFipsEndpoint }) => {
    if (signingRegion) {
        return signingRegion;
    }
    else if (useFipsEndpoint) {
        const regionRegexJs = regionRegex.replace("\\\\", "\\").replace(/^\^/g, "\\.").replace(/\$$/g, "\\.");
        const regionRegexmatchArray = hostname.match(regionRegexJs);
        if (regionRegexmatchArray) {
            return regionRegexmatchArray[0].slice(1, -1);
        }
    }
};