How can regular expressions be used to achieve character replacement in PHP?

Regular expressions can be used in PHP to achieve character replacement by using the `preg_replace()` function. This function allows you to search for a specific pattern in a string and replace it with another pattern. By defining the pattern you want to search for and the replacement pattern, you can easily perform character replacement in PHP using regular expressions. 

$string = "Hello, World!";
$pattern = '/o/';
$replacement = '0';
$new_string = preg_replace($pattern, $replacement, $string);
echo $new_string; // Output: Hell0, W0rld!

Keywords

regular expressions character replacement PHP preg_replace regex

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