elisp substitution

[matt]

I'm just starting to play around with emacs lisp. A quick question. How 
can I manipulate variables in elisp? For instance, I want to take a 
string and add a backslash(escape) to all whitespace. Like in a path like
"c:/Documents and settings/" I want to change it to
"c:/Documents\ and\ Settings/".

Something similar to this in perl: $var =~ s/( )/\\$1/g;

Thanks,

Matt
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