regular expression help. <img src=<?php echo($...); ?>

[blackhorse]

I want to replace

<img src="<?php echo($...); ?>"

with

<img src="<?php echo(htmlentities($...)); ?>"

...are any characters here.

Could someone help me with a regular expression script to do this work?

Basically, I want to apply htmlentities to the image source name. Although, when in my code when these images uploaded, I already checked the validation of the image name which only allow English letters and numbers, plus -_ and dot.

Here is my script

Find: <img src="<?php echo($(.) ); ?>"
replace <img src="<?php echo(htmlentities($(.) )); ?>"

I used escape on ( and ), do I need to use escape on other characters in my script? And try to use this in dreameaver find/replace with regular expression. I cannot find the codes I was looking for to replace.

By the way, if I already have the codes to check the image name validation when I upload them, and now I am trying to apply htmlentities on the image name in the src="", is this redundancy good or bad?

Thanks!

[NogDog]

Untested, so no guarantees:

<?php
$search = '/<img src="<\?php echo\(([^)]+\);\s*\?>"/i';
$replace = '<img src="<?php echo(htmlentities(\\1, ENT_QUOTES)); ?>';
$newText = preg_replace($search, $replace, $oldText);