regexp.js (1523B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2021 The Stdlib Authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 'use strict'; 20 21 // MODULES // 22 23 var reUtf16UnpairedSurrogate = require( './main.js' ); 24 25 26 // MAIN // 27 28 /** 29 * Matches an unpaired UTF-16 surrogate. 30 * 31 * Regular expression: `/(?:[^\uD800-\uDBFF]|^)[\uDC00-\uDFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])/` 32 * 33 * - `(?:[^\uD800-\uDBFF]|^)` 34 * - capture but do not remember anything which is not a high surrogate, including nothing 35 * 36 * - `[\uDC00-\uDFFF]` 37 * - match a low surrogate 38 * 39 * - `|` 40 * - OR 41 * 42 * - `[\uD800-\uDBFF]` 43 * - match a high surrogate 44 * 45 * - `(?![\uDC00-\uDFFF])` 46 * - but only accept the previous match if not followed by a low surrogate 47 * 48 * 49 * @constant 50 * @type {RegExp} 51 * @default /(?:[^\uD800-\uDBFF]|^)[\uDC00-\uDFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])/ 52 */ 53 var RE_UTF16_UNPAIRED_SURROGATE = reUtf16UnpairedSurrogate(); // eslint-disable-line id-length 54 55 56 // EXPORTS // 57 58 module.exports = RE_UTF16_UNPAIRED_SURROGATE;