<?php $text = 'ignore everything except this (text)'; preg_match('#\((.*?)\)#', $text, $match); echo ''; print_r($match[1]); echo '';
square bracket :
<?php $text = 'ignore everything except this (text)'; preg_match('#\<(.*?)\>#', $text, $match); echo ''; print_r($match[1]); echo '';
REFERENCES
http://stackoverflow.com/questions/196520/php-best-way-to-extract-text-within-parenthesis