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import assertString from './util/assertString';
var localeReg = /^[A-Za-z]{2,4}([_-]([A-Za-z]{4}|[\d]{3}))?([_-]([A-Za-z]{2}|[\d]{3}))?$/;
export default function isLocale(str) {
assertString(str);
if (str === 'en_US_POSIX' || str === 'ca_ES_VALENCIA') {
return true;
}
return localeReg.test(str);
}