$re = '/(?<="email":\[).+(?=])/m';
$str = 'dias","telephone":"","email":["wsdxczc@gmail.com"],"address":{"@type":"PostalAddress","s
dias","telephone":"","email":["wsdxc111zc@gmail.com","info@site.ee"],"address":{"@type":"PostalAddress","s
dias","telephone":"","email":["wsdxczc@gmail.co234m","info@site.ee"],"address":{"@type":"PostalAddress","s
dias","telephone":"","email":["wsdx2342czc@gma234il.com","info@site.ee"],"address":{"@type":"PostalAddress","s
dias","telephone":"","email":["wsdx23423czc@gm234ail.com","info@site.ee","info@site.ee"],"address":{"@type":"PostalAddress","s ';
$subst = "";
$result = preg_replace($re, $subst, $str);
echo "The result of the substitution is ".$result;
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php