Regex Quiz. Quoted text with escapes

Question

Quiz:

Validate a line in quotes. Return one (and only one) backreference with the text. ie: quoted text from "quoted text". Note: a \ escapes any char, so \" is a valid escape.

I know it's a common question and already been answered lots of times, but the problem is that no answer fits the correct for this quiz.

I started from simple (empty quotes are valid, should return null value in the backreference):

(?<=\s|^)"(.*?[^\\])?"(?=\s|$)

It shouldn't match "text"with quote". Only escaped quotes are allowed inside the main (opening and closing) quotes. You could use [^"].

Tried with backreferencing

((?<![\\])['"])((?:.(?!(?<![\\])\1))*.?)\1

You're using more than 1 group. Please only allow your pattern to set one backreference.

Check https://stackoverflow.com/questions/249791/regex-for-quoted-string-with-escaping-quotes, try `(["\']).*?(?<!\\)(?:\\\\)*\1`, or `"([^"\\]*(?:\\.[^"\\]*)*)"` — Wiktor Stribiżew, Sep 09 '19 at 12:27
So, it is https://stackoverflow.com/a/10786066/3832970 with the nested group turned into non-capturing. — Wiktor Stribiżew, Sep 09 '19 at 12:47

score 0 · Answer 1 · answered Sep 09 '19 at 12:53

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This one was accepted by quiz

^"([^"\\]*(?:\\.[^"\\]*)*)"$

answered Sep 09 '19 at 12:53

Alex Smoke

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Regex Quiz. Quoted text with escapes

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