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Regexp-Alternation: task3: Открывающая кавычка не экранируется#1355
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Regexp-Alternation: task3: Открывающая кавычка не экранируется#1355
Batmaev wants to merge3 commits intojavascript-tutorial:masterfromBatmaev:Batmaev-Regexp-Alternation
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CLAassistant commentedJul 21, 2021 • edited
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Строка |
Вы правы. Сейчас сделаю |
Ошибка. Двойная кавычка после обратного слеша НЕ может начинать строку. |
Может: letregexp=/"(\\.|[^"\\])*"/g;// Ваше решениеletstr=' .. \\"a" .. ';// Поставим обратный слэш перед открывающей кавычкойalert(str.match(regexp));// "a" // всё ещё сопоставляется |
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Задача:
Авторское решение проверяет, что закрывающая кавычка не экранирована. Но открывающую кавычку оно не проверяет.
Наверное, это потому, что если обратный слеш стоит перед открывающей кавычкой, то он как бы находится вне строки и не способен экранировать.
Я подумал, что это нужно пояснить в условии. Иначе человек может подумать, что открывающую кавычку тоже нужно проверить. Для этого ему понадобятся ретроперспективные проверки, которые рассмотрены только в следующей главе.