Home >Backend Development >PHP Tutorial >Why Am I Getting the 'preg_replace(): Unknown Modifier' Error in PHP?
This error occurs when the modifiers used in a regular expression are not recognized by the PHP preg_replace() function.
Two common causes include:
Consider the following code:
echo str_replace("</ul></div>", "", preg_replace("<div[^>]*><ul[^>]*>", "", wp_nav_menu(array('theme_location' => 'nav', 'echo' => false)) ));
This code might produce the error because the regular expressions lack delimiters:
<div[^>]*><ul[^>]
1. Adding Delimiters:
Enclose the pattern with valid delimiters, such as:
preg_replace "~<div[^>]*><ul[^>]~", "", ...
2. Escaping Delimiters:
If the pattern contains the delimiter character, escape it using :
preg_replace "/foo[^/]+bar/i", "", ...
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