Challenges

Extract every double-quoted string, including its quotes, where a backslash escapes the next character.

Match text containing a quoted section — opened and closed by the same quote character, single or double.

Capture the key and the value from a "key = value" line, whatever the spacing.

Pull the timestamp, the level and the message out of a bracketed log line.

Extract the fields of a CSV row, where a quoted field may contain commas. Quoted fields keep their quotes.