如何使用PHP preg_replace替换令牌

Question

I have a string in $body that looks like this:

<td style="vertical-align: top; border: 1px solid gray;">[COMMENT2]</td>

I would like to replace the token [COMMENT2] with the word "None" using something this:

$body = preg_replace('\[.*\]', 'None', $body);

What am I missing?

Answer 1

You should add delimiters / or ~ to your regex like this /\[.*\]/

Php code

<?php
   $body='<td style="vertical-align: top; border: 1px solid gray;">[COMMENT2]</td>';
   $body = preg_replace('/\[.*?\]/', 'None', $body);
   echo $body;
?>

Output:

<td style="vertical-align: top; border: 1px solid gray;">None</td>

<kbd>Ideone Demo</kbd>

<kbd>Regex101 Demo</kbd>

<kbd>More about Php delimiters here.</kbd>