$re = '/(?<=[^\w-:])[+-]?\d+(?=\s|$)/m';
$str = '
id = 1
id = 1 and lpo=2
id = -1
id=-1
id=1
id >-1
id >1
id > -1
id > 1
id<-1
id<1
id > -1
id > 1
date=22-11-2014
date = 22-11-2014
date = 22-11-2014 00:00:00';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
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