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'use strict';
const isRegexp = require('is-regexp');
const flagMap = {
global: 'g',
ignoreCase: 'i',
multiline: 'm',
dotAll: 's',
sticky: 'y',
unicode: 'u'
};
module.exports = (regexp, options = {}) => {
if (!isRegexp(regexp)) {
throw new TypeError('Expected a RegExp instance');
}
const flags = Object.keys(flagMap).map(flag => (
(typeof options[flag] === 'boolean' ? options[flag] : regexp[flag]) ? flagMap[flag] : ''
)).join('');
const clonedRegexp = new RegExp(options.source || regexp.source, flags);
clonedRegexp.lastIndex = typeof options.lastIndex === 'number' ?
options.lastIndex :
regexp.lastIndex;
return clonedRegexp;
};
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