custom bbcode with ' or " in param

[matkus]

Hello.

I have some problem. I want to create custom bbcode, that will link to something. Lets say user types
[mybb]something[/mybb]
and it is converted to
<a href="http://example.com/?param=something">something</a>
Everything works fine if i simply add custom bb code, but when {param} have ' or ", because it closes href in link and it does not work anymore as expected. Is there any way to fix this without modding? Or if it need mod, can anyone give me small example or link to some mod, that i could use as example to create my own?