28 lines
698 B
JavaScript
28 lines
698 B
JavaScript
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const toString = Object.prototype.toString;
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function isRegExp (o) {
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return 'object' == typeof o
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&& '[object RegExp]' == toString.call(o);
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}
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module.exports = exports = function (regexp) {
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if (!isRegExp(regexp)) {
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throw new TypeError('Not a RegExp');
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}
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const flags = [];
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if (regexp.global) flags.push('g');
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if (regexp.multiline) flags.push('m');
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if (regexp.ignoreCase) flags.push('i');
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if (regexp.dotAll) flags.push('s');
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if (regexp.unicode) flags.push('u');
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if (regexp.sticky) flags.push('y');
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const result = new RegExp(regexp.source, flags.join(''));
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if (typeof regexp.lastIndex === 'number') {
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result.lastIndex = regexp.lastIndex;
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}
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return result;
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}
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