59 lines
1.5 KiB
JavaScript
59 lines
1.5 KiB
JavaScript
|
/**
|
||
|
|
* @license Apache-2.0
|
||
|
|
*
|
||
|
|
* Copyright (c) 2021 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 reUtf16UnpairedSurrogate = require( './main.js' );
|
||
|
|
|
||
|
|
|
||
|
|
// MAIN //
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Matches an unpaired UTF-16 surrogate.
|
||
|
|
*
|
||
|
|
* Regular expression: `/(?:[^\uD800-\uDBFF]|^)[\uDC00-\uDFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])/`
|
||
|
|
*
|
||
|
|
* - `(?:[^\uD800-\uDBFF]|^)`
|
||
|
|
* - capture but do not remember anything which is not a high surrogate, including nothing
|
||
|
|
*
|
||
|
|
* - `[\uDC00-\uDFFF]`
|
||
|
|
* - match a low surrogate
|
||
|
|
*
|
||
|
|
* - `|`
|
||
|
|
* - OR
|
||
|
|
*
|
||
|
|
* - `[\uD800-\uDBFF]`
|
||
|
|
* - match a high surrogate
|
||
|
|
*
|
||
|
|
* - `(?![\uDC00-\uDFFF])`
|
||
|
|
* - but only accept the previous match if not followed by a low surrogate
|
||
|
|
*
|
||
|
|
*
|
||
|
|
* @constant
|
||
|
|
* @type {RegExp}
|
||
|
|
* @default /(?:[^\uD800-\uDBFF]|^)[\uDC00-\uDFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])/
|
||
|
|
*/
|
||
|
|
var RE_UTF16_UNPAIRED_SURROGATE = reUtf16UnpairedSurrogate(); // eslint-disable-line id-length
|
||
|
|
|
||
|
|
|
||
|
|
// EXPORTS //
|
||
|
|
|
||
|
|
module.exports = RE_UTF16_UNPAIRED_SURROGATE;
|