PHP-regex忽略花括号之间的所有内容（甚至是花括号）[关闭]

Please help, how can i retrieve text0 and text4 in the subject below:

text0{tex1{text2}text3}text4

Anchor it!

$text = 'text0{tex1{text2}text3}text4';
if (preg_match('/^(\w+){[\w{}]+}(\w+)$/', $text, $matches))
{
    list(,$start, $finish) = $matches;

}

$start will be "text0" and $finish will be "text4"

If you want the content outside the brackets, you can use this:

preg_match_all('~(?<out>[^{]++)|({(?>[^{}]++|(?2))*+})~', $string, $matches);
print_r($matches['out']);