Are there potential pitfalls in using regular expressions to replace \n with <br> in PHP, particularly when handling multiple occurrences of [nobr] segments?

When using regular expressions to replace \n with <br> in PHP, potential pitfalls may arise when handling multiple occurrences of [nobr] segments. To avoid these pitfalls, one approach is to first replace [nobr] segments with a unique placeholder, then perform the \n to <br> replacement, and finally revert the unique placeholder back to [nobr]. 

&lt;?php
$text = &quot;This is a sample text with\n[nobr]line breaks[/nobr]\nand\n[nobr]multiple occurrences[/nobr] of [nobr]nobr[/nobr] segments.&quot;;

// Replace [nobr] segments with a unique placeholder
$text = preg_replace(&#039;/\[nobr\](.*?)\[\/nobr\]/&#039;, &#039;###nobr###$1###/nobr###&#039;, $text);

// Replace \n with &lt;br&gt;
$text = preg_replace(&#039;/\n/&#039;, &#039;&lt;br&gt;&#039;, $text);

// Revert unique placeholder back to [nobr]
$text = str_replace([&#039;###nobr###&#039;, &#039;###/nobr###&#039;], [&#039;[nobr]&#039;, &#039;[/nobr]&#039;], $text);

echo $text;
?&gt;

Keywords

regular expressions \n <br> PHP multiple occurrences

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