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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';
// MAIN //
/**
* Returns a regular expression to match a relative require/import literal.
*
* @private
* @returns {RegExp} regular expression
*/
function createRegExp() {
/*
* Regular expression to match a relative require/import literal.
*
* ## Examples
*
* - `'..'`
* - `'../'`
* - `'.'`
* - `'./'`
* - `'/'`
* - `'C:\'`
* - `'c:/'`
*
* Regular expression: `/^(?:\.\.?(?:[\\\/]|$)|\/|(?:[A-Za-z]:)?[\\\/])/`
*
* - `^`
* - match anything which begins with
*
* - `(?:`
* - begin capture but do not remember (1)
*
* - `\.\.?`
* - match a `.` literal possibly followed by another `.` literal
*
* - `(?:[\\\/]|$)`
* - capture but do not remember a `\\` or `/` literal OR end of string (2)
*
* - `|`
* - OR
*
* - `\/`
* - match a `/` literal
*
* - `|`
* - OR
*
* - `(?:`
* - begin capture but do not remember (3)
*
* - `[A-Za-z]:`
* - a drive letter followed by a `:` literal
*
* - `)`
* - end of capture (3)
*
* - `?`
* - match 0 or 1 time
*
* - `[\\/\]`
* - match a `\\` or `/` literal
*
* - `)`
* - end of capture (1)
*/
return /^(?:\.\.?(?:[\\/]|$)|\/|(?:[A-Za-z]:)?[\\/])/;
}
// EXPORTS //
module.exports = createRegExp;
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