main.js (1250B)
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 // MAIN // 22 23 /** 24 * Returns a regular expression to match a UTF-16 unpaired surrogate. 25 * 26 * @returns {RegExp} regular expression 27 * 28 * @example 29 * var RE_UTF16_UNPAIRED_SURROGATE = reUtf16UnpairedSurrogate(); 30 * 31 * var bool = RE_UTF16_UNPAIRED_SURROGATE.test( '\uD800' ); 32 * // returns true 33 * 34 * bool = RE_UTF16_UNPAIRED_SURROGATE.test( '\uDC00' ); 35 * // returns true 36 * 37 * bool = RE_UTF16_UNPAIRED_SURROGATE.test( 'abc' ); 38 * // returns false 39 */ 40 function reUtf16UnpairedSurrogate() { 41 return /(?:[^\uD800-\uDBFF]|^)[\uDC00-\uDFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])/; 42 } 43 44 45 // EXPORTS // 46 47 module.exports = reUtf16UnpairedSurrogate;