capture a string with escape

/"(?:\\"|.)*?"/su

• ?: instructs non-capture
• \\\\ will be \\ in php and it will be \ in regex
• *? is a lasy repetition. Trys to get out of the repetition rule whenever it gets a chance

123"abc"defg"xyz"456 = true : "abc"
123"abc\"defg"xyz"456 = true : "abc\"defg"
123"abc\"defg\"xyz"456 = true : "abc\"defg\"xyz"