如何在PHP中删除自定义标记？

Question

I am trying to remove following tag from string.

[caption id="attachment_9" align="alignleft" width="137" caption="test"][/caption]

How do I remove it using php's preg_replace?

I tried several regular expression, but failed all.

Answer 1

$output_string = preg_replace('#\[caption[^\]]*\](.*?)\[/caption\]#m', "$1", $input_string)

or if you also want to remove anything between the opening and closing tag, just change "$1" to "".