php: regular expression regex

gistfile1.txt

If you would like to remove a tag along with the text inside it then use the following code. 

<?php 
preg_replace('/(<tag>.+?)+(<\/tag>)/i', '', $string); 
?> 

example 
<?php $string='<span class="normalprice">55 PKR</span>'; ?> 

<?php 
$string = preg_replace('/(<span class="normalprice">.+?)+(<\/span>)/i', '', $string); 
?> 

This will results a null or empty string. 

<?php 
$string='My String <span class="normalprice">55 PKR</span>'; 

$string = preg_replace('/(<span class="normalprice">.+?)+(<\/span>)/i', '', $string); 
?> 

This will results a " My String"