I am new to RegEx and simply want to replace all occurrences of certain characters in a string while retaining the replaced character's case, for instance, if my string is "Anangelo" and I replace "an" with "an", I want the result to be :

Anangelo

Any ideas?

I am new to RegEx and simply want to replace all occurrences of certain characters in a string while retaining the replaced character's case, for instance, if my string is "Anangelo" and I replace "an" with "an", I want the result to be :

Anangelo

Any ideas?

You can use preg_replace() function.

Example :

<?php
$str = "Anangelo";

// CASE SENSITIVE //
$output = preg_replace("/An/","An",$str);

// IGNORE CASE SENSITIVE //
$output = preg_replace("/An/i","An",$str);

?>

I think you are looking somethin like this only ?