How do I delete everything between two tags in a string?

<A> text1 </A>
<B> text2 </B>
<C> text3
more text3  </C>
<D> text4  </D>
[/code:1hzlz4g7] 
and I want to delete some of them. I think this could be done with RegexReplace but I don't know how. What should my RegexReplace expression be if I want to delete (for example)  everything from <C> to </C>?

RegexReplace( String , "<C>[\s\S]*?<\/C>" , "g" , "")[/code:2jwaee1u]
But I don't understand why this doesn't work in Construct 2, it works perfectly in [url=http://www.regexpal.com/]http://www.regexpal.com/[/url]. Even RegexMatchCount returns 0, is it maybe a C2 bug?

"var str = '"&varWithMyString&"';
str= str.replace(/<C>[\s\S]*?<\/C>/, '');
c2_callFunction('myFunction',[str]);"[/code:31r82g5e]
Function --> On "myFunction" --> Set text to Function.Param(0)

This should work but... it doesn't  <img src="{SMILIES_PATH}/icon_neutral.gif" alt=":|" title="Neutral"> 

That's not just plain ole text, its formatted html on different lines.

It doesn't matter, it doesn't work with plain text either. I've already tried. Anyway, if it works at [url=http://www.regexpal.com/]http://www.regexpal.com/[/url], it should also work in C2...