59 lines
1.5 KiB
JavaScript
59 lines
1.5 KiB
JavaScript
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2021 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var reUtf16UnpairedSurrogate = require( './main.js' );
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// MAIN //
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/**
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* Matches an unpaired UTF-16 surrogate.
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*
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* Regular expression: `/(?:[^\uD800-\uDBFF]|^)[\uDC00-\uDFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])/`
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*
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* - `(?:[^\uD800-\uDBFF]|^)`
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* - capture but do not remember anything which is not a high surrogate, including nothing
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*
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* - `[\uDC00-\uDFFF]`
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* - match a low surrogate
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*
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* - `|`
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* - OR
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*
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* - `[\uD800-\uDBFF]`
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* - match a high surrogate
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*
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* - `(?![\uDC00-\uDFFF])`
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* - but only accept the previous match if not followed by a low surrogate
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*
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*
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* @constant
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* @type {RegExp}
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* @default /(?:[^\uD800-\uDBFF]|^)[\uDC00-\uDFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])/
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*/
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var RE_UTF16_UNPAIRED_SURROGATE = reUtf16UnpairedSurrogate(); // eslint-disable-line id-length
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// EXPORTS //
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module.exports = RE_UTF16_UNPAIRED_SURROGATE;
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