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32 lines
651 B
JavaScript
32 lines
651 B
JavaScript
'use strict';
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var isRegexp = require('is-regexp');
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var isSupportedRegexpFlag = require('is-supported-regexp-flag');
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var flagMap = {
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global: 'g',
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ignoreCase: 'i',
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multiline: 'm'
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};
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if (isSupportedRegexpFlag('y')) {
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flagMap.sticky = 'y';
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}
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if (isSupportedRegexpFlag('u')) {
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flagMap.unicode = 'u';
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}
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module.exports = function (re, opts) {
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if (!isRegexp(re)) {
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throw new TypeError('Expected a RegExp instance');
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}
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opts = opts || {};
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var flags = Object.keys(flagMap).map(function (el) {
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return (typeof opts[el] === 'boolean' ? opts[el] : re[el]) ? flagMap[el] : '';
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}).join('');
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return new RegExp(opts.source || re.source, flags);
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};
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