What is the difference between ereg_replace and preg_replace functions in PHP?

The main difference between ereg_replace and preg_replace functions in PHP is that ereg_replace uses POSIX extended regular expressions, while preg_replace uses Perl-compatible regular expressions. Since POSIX extended regular expressions are deprecated in PHP, it is recommended to use preg_replace for better performance and compatibility with modern PHP versions. 

// Using preg_replace to replace a pattern in a string
$string = "Hello, World!";
$pattern = "/Hello/";
$replacement = "Hi";
$new_string = preg_replace($pattern, $replacement, $string);
echo $new_string;

Keywords

ereg_replace preg_replace PHP regular expressions differences

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