[TxMt] regex in a snippet

[Saul Rosenbaum]

Howdy;
Finally getting around to tweaking some html snippets, and I'm stuck -

this is what I have:
<li id="${1}"><a href="#">$1</a></li>$2

what I'm trying to accomplish is (replacing the spaces with underscores and
making it all lowercase)
<li id="this_is_a_mixed_case_string_with_spaces"><a href="#">This is a Mixed
case String with SPACES</a></li>

I'd really like to understand how to accomplish this (rather than just get
an answer).

thanks in advance

saul
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