(PHP 8)
preg_last_error_msg — Returns the error message of the last PCRE regex execution
preg_last_error_msg ( ) : string
Returns the error message of the last PCRE regex execution.
This function has no parameters.
Returns the error message on success, or "No error"
if no error has occurred.
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https://www.php.net/manual/en/function.preg-last-error-msg.php