Solve the installation problem of Crayon Syntax Highlighter

After php7.3/7.4, Crayon Syntax Highlighter plug-in reports an error: Compilation failed: invalid range in character class at offset 4.

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Error description

After installing Crayon Syntax Highlighter, an error is reported in the WordPress background

Compilation failed: invalid range in character class at offset 4

Reason for error

This is a problem after the installation of the syntax highlighting plugin Crayon Syntax Highlighter after php7.3. Locate this line in the crayon_langs.class.php file in the plugin directory.

return preg_replace('/[^\w-+#]/msi', '', $id);

The rewritten code is as follows:

// Override
function clean_id($id) {
	$id = CrayonUtil::space_to_hyphen( strtolower(trim($id)) );
	// PARSED_ERRORS
	//return preg_replace('/[^\w-+#]/msi', '', $id);
	// So
	return preg_replace('/[^\w\-+#]/msi', '', $id);
}

Reference from:

https://crunchify.com/fix-for-crayon-syntax-highlighter-wordpress-plugin-and-php-7-3-fatal-error/

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Original link: Solve the installation problem of Crayon Syntax Highlighter