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/**
* @license Apache-2.0
*
* Copyright (c) 2019 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var replace = require( '@stdlib/string/replace' );
// VARIABLES //
var RE_REGEXP_CHARS = /[-[\]{}()*+?.,\\^$|#\s]/g;
// MAIN //
/**
* Returns a regular expression for matching an `index` file.
*
* ## Notes
*
* - Example output:
*
* ```text
* /^index(?:\.js|\.node)$/
* ```
*
* @private
* @param {Array} exts - supported `require` extensions
* @returns {RegExp} regular expression
*/
function createRegExp( exts ) {
var re;
var i;
re = '^index(?:';
for ( i = 0; i < exts.length; i++ ) {
re += replace( exts[ i ], RE_REGEXP_CHARS, '\\$&' );
if ( i < exts.length-1 ) {
re += '|';
}
}
re += ')$';
return new RegExp( re );
}
// EXPORTS //
module.exports = createRegExp;
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