Simple Chat Room in NodeJS, expressJS and mongoDB in Docker Swarm
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4 years ago
const toString = Object.prototype.toString;
function isRegExp (o) {
return 'object' == typeof o
&& '[object RegExp]' == toString.call(o);
}
module.exports = exports = function (regexp) {
if (!isRegExp(regexp)) {
throw new TypeError('Not a RegExp');
}
const flags = [];
if (regexp.global) flags.push('g');
if (regexp.multiline) flags.push('m');
if (regexp.ignoreCase) flags.push('i');
if (regexp.dotAll) flags.push('s');
if (regexp.unicode) flags.push('u');
if (regexp.sticky) flags.push('y');
const result = new RegExp(regexp.source, flags.join(''));
if (typeof regexp.lastIndex === 'number') {
result.lastIndex = regexp.lastIndex;
}
return result;
}