正则表达式（preg_match）

Question

This is the not working code:

<?php
$matchWith = "  http://videosite.com/ID123 ";
preg_match_all('/\S\/videosite\.com\/(\w+)\S/i', $matchWith, $matches);  
foreach($matches[1] as $value)
{  
    print '<a href="http://videosite.com/'.$value.'">Hyperlink</a>';        
}  
?>

What I want is that it should not display the link if it has a whitespace before or after. So now it should display nothing. But it still displays the link.

Answer 1

This can also match ID12, because 3 is not an space, and the / of http:/ is not a space. You can try:

preg_match_all('/^\S*\/videosite\.com\/(\w+)\S*$/i', $matchWith, $matches);