What could be the potential reasons for the "Call to undefined function preg_match()" error in PHP?

The "Call to undefined function preg_match()" error in PHP occurs when the preg_match() function is called but the PCRE (Perl Compatible Regular Expressions) extension is not enabled in the PHP configuration. To solve this issue, you need to enable the PCRE extension in your PHP configuration.

// Enable PCRE extension in PHP configuration
// Locate your php.ini file and uncomment or add the following line:
// extension=pcre.so