PHP Regex to remove non-related content but leave content within blocks

I need help to fix my regex, say if there is text like:

bl开发者_StackOverflow中文版a bla [bla1]something[/bla1] bla bla [bla2]something else[/bla2] bla bla bla

I want everything in bla1 and bla2 removed, including those tags. Can someone help me?

Thank you.

If all you need is just to remove tags, then try:

$str = 'bla bla [bla1]something[/bla1] bla bla [bla2]something else[/bla2] bla bla bla';

$result = preg_replace('~\[([^\]]+)\].*?\[/\\1\]~', '', $str);

var_dump($result);

Use regex:

\[bla1\]\s*(((?!\[bla1\]|\[/bla1\]).)+)\s*\[/bla1\]

to get everythign between bla1 and bla2, and then you can remove it

you don't need regex for that... I would use strpos, explode and substr for that functionality. further reading:

http://php.net/manual/en/function.strpos.php

http://php.net/manual/en/function.substr.php

http://php.net/manual/en/function.explode.php

http://php.net/manual/en/function.str-replace.php

for example:

replace "[bla]" and [/bla] for ~bla~ and than explode on ~bla~.