How can PHP developers prevent unintended replacements when working with specific markup rules like [img] and [/img]?

When working with specific markup rules like [img] and [/img], PHP developers can prevent unintended replacements by using regular expressions with boundaries to ensure that the replacements are only made within the specified markup tags. This way, other instances of the specified text outside of the markup tags will be ignored. 

$content = "[img]This is an [img]example[/img] of an image[/img] embedded in text.";
$pattern = '/\[img\](.*?)\[\/img\]/';
$replacement = '<img src="$1">';
$new_content = preg_replace($pattern, $replacement, $content);
echo $new_content;

Keywords

PHP markup rules unintended replacements regular expressions string manipulation

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