Regex vs Filter/Count/Ctype

gistfile1.php

<?php

set_time_limit( 0 );

$searchText = 'Page and Brin originally nicknamed THEIR new search engine "BackRub", because the system checked backlinks to estimate the importance of a site.';

$start = microtime_float();
for( $i = 0 ; $i < 1000000 ; $i++ )
{
    preg_match_all("/[A-Z]{1}[a-zA-z]*/", $searchText, $matches );
}
$total = microtime_float() - $start;
echo "Took $total seconds<br/>";


$str = $searchText;
$start = microtime_float();
for( $i = 0 ; $i < 1000000 ; $i++ )
{
    $result = array_filter(str_word_count($str, 1), function($item) {
        return ctype_upper($item[0]);
    });
}
$total = microtime_float() - $start;
echo "Took $total seconds<br/>";





function microtime_float()
{
    list($usec, $sec) = explode(" ", microtime());
    return ((float)$usec + (float)$sec);
}