What are some common challenges faced when using preg_replace in PHP?

One common challenge when using preg_replace in PHP is that it may not work as expected due to incorrect regular expressions or incorrect usage of the function. To solve this, make sure to carefully construct the regular expression pattern and understand how preg_replace works. Additionally, be aware of the potential escaping needed for special characters in the regular expression.

// Example of using preg_replace with correct regular expression pattern
$string = "Hello, World!";
$pattern = "/Hello/";
$replacement = "Hi";
$new_string = preg_replace($pattern, $replacement, $string);
echo $new_string; // Output: Hi, World!