Are there best practices for maintaining certain characters while using preg_replace in PHP?

When using preg_replace in PHP, it's important to be mindful of certain characters that may have special meanings in regular expressions, such as backslashes and dollar signs. To maintain these characters while using preg_replace, you can escape them using the preg_quote function before passing them to the pattern parameter. 

$pattern = '/\$[0-9]/'; // Example pattern containing a dollar sign
$replacement = 'X';
$string = 'Price: $5';

$escaped_pattern = preg_quote($pattern, '/');

$result = preg_replace('/' . $escaped_pattern . '/', $replacement, $string);

echo $result; // Output: Price: X

Keywords

preg_replace PHP characters maintaining regex

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