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Ilya Kantor 2017-03-21 17:14:05 +03:00
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10-regular-expressions-javascript/11-regexp-alternation/03-match-quoted-string/task.md
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# Find quoted strings
Create a regexp to find strings in double quotes `subject:"..."`.
The important part is that strings should support escaping, in the same way as JavaScript strings do. For instance, quotes can be inserted as `subject:\"` a newline as `subject:\n`, and the slash itself as `subject:\\`.
```js
let str = "Just like \"here\".";
```
For us it's important that an escaped quote `subject:\"` does not end a string.
So we should look from one quote to the other ignoring escaped quotes on the way.
That's the essential part of the task, otherwise it would be trivial.
Examples of strings to match:
```js
.. *!*"test me"*/!* ..
.. *!*"Say \"Hello\"!"*/!* ... (escaped quotes inside)
.. *!*"\\"*/!* .. (double slash inside)
.. *!*"\\ \""*/!* .. (double slash and an escaped quote inside)
```
In JavaScript we need to double the slashes to pass them right into the string, like this:
```js run
let str = ' .. "test me" .. "Say \\"Hello\\"!" .. "\\\\ \\"" .. ';
// the in-memory string
alert(str); // .. "test me" .. "Say \"Hello\"!" .. "\\ \"" ..
```