php preg_replace忽略内容中的$ n

Question

My current regex is /[$]([a-zA-Z0-9_\-\,:]*)[$]/ and this will allow me to replace strings like the following for our CMS:

$ContentArea1$
$blog:PostTitle$

However when we have content which has prices in dollars preg_replace gets rid of the first part of the price e.g. $15 $1 $2 etc

How can I make preg_replace ignore prices within the content?

    <?

    $message = 'Below is an example for the content replacement<br/><br/><br/>$ContentArea1$';

    $newMessage = '<h2>Website Coming soon</h2>
<p>
    Are new website will be online soon.</p>
<p>
    Price: $2.50</p>
<h2>
    Twitter Feed</h2>
';





    echo preg_replace('/[$]ContentArea1[$]/',$newMessage,$message);

?>

Answer 1

You can extend your regular expression to include $ followed by numbers so that the $ in price values are non-terminating:

/[$]((?:[a-zA-Z0-9_\-\,:]*)(?:[$]\d)?)+[$]/