gistfile1.php

<?php

$strings = array(
    'adsfa sdf adf asdf asdf adfasdfa sdf asdf',
    'i like to buy ^abc, ^aa, ^aaaa, ^d.',
    '^^Here is my twitter comment.',
    'Here is my tweet. ^^I like turtles.'
);

foreach ($strings as $str) {
    echo $str . "\n";
    var_dump(preg_match('/\^\^/', $str));
    $m = array();
    var_dump(preg_match_all('/\^(?P<cities>[a-z]{2,})/i', $str, $m));
    print_r($m);
}

?>