PHP提取双引号之间的字符串

Question

I need to extract a string with any symbols between a doublequotes using preg_match including double quotes as well.

I've tried all solutions in the question below but nothing has worked for my case: php to extract a string from double quote

Sample string: "ASD ""ASD ADS"""

I need to extract: ASD ""ASD ADS""

Current code which is working except I don't know how to handle the exception above which ruining whole structure:

$regex = '/"(.*)"/imU';
$content = file_get_contents($file->getRealPath());
$filename = $file->getClientOriginalName();

preg_match_all($regex, $content, $matches);

return $matches[0];

Answer 1

To serve properly 2 adjacent double quotes between the opening and closing double quote, you must use 2 alternatives: either a char other than the double quote or 2 consecutive double quotes.

So the regex can be as follows:

/"(?:[^"]|"")+"/g

Description:

• " - Match the "opening" double quote.
• (?: - Start of a non-capturing group, needed due to the + quantifier after it.
  • [^"] - The first alternative - any char other than the double quote.
• | - Or.
  • "" - Two double quotes.
• ) - End of the non-capturing group.
• + - This group can occur 1 or more times.
• " - Match the "closing" double quote.

It is enough to use g option only.