One of my BBCode is not being parsed

It's my first turn to use this BBCode package for my project. Almost all BBCodes are being parsed properly except the one BBCode and that is:

**[COLOR=BLUE]L'elenco delle scuole di design è ordinato alfabeticamente.[/COLOR]**

I have also checked the configuration file for all BBCodes. Everything is looking fine. But, I am still facing this issue.
