One of my BBCode is not being parsed

[mirzavel]

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.