如何只用preg_replace匹配整个单词？ [重复]

Question

Possible Duplicate:
How exactly do Regular Expression word boundaries work in PHP?

How can I match the whole word only with preg_replace()?

$string = 'C:\wamp\www\global_tolerance_2012\global\models'


$new_string = str_replace('\\', '/',preg_replace('#(.*?)(global).*#', '$1', $string));

result,

C:/wamp/www/

the result I want,

C:/wamp/www/global_tolerance_2012/

Answer 1

$string = 'C:\wamp\www\global_tolerance_2012\global\models';
$new_string = str_replace( '\\', '/', $string );
$new_string = preg_replace('#/(local|global)/.*#si', '/', $new_string);