[TxMt] substitute space w/ underscore within snippets

I made a HTML snippet that takes a list such as:

Home Info Contact

and turns it into:

<ol id="navbar"> <li class="home"><a href="home.php" title="Go to the Home page">Home</a></li> <li class="info"><a href="info.php" title="Go to the Info page">Info</a></li> <li class="contact"><a href="contact.php" title="Go to the Contact page">Contact</a></li> </ol>

That's what I got so far:

<ol id="navbar"> ${TM_SELECTED_TEXT/.+/ <li class="\L$0"><a href="$0\E.php" title="Go to the $0 page">$0</a></li>/g} </ol>

My problem is if one of the menu item is more than one word, I'd like to replace the space in the name with an underscore in the URI. Anyone's got the code for that?

Thanks!