Re: [string totitle "ab cd ef"] does not output "Ab Cd Ef" but in

Ok, no more confusing strings with lists...
Would there be any divantage if you turn the string into a list
first and join the result into a string?

proc wordsToTitle {string} {
foreach item [split $string] {lappend output [string totitle $item]}
return [join $output]
}

It doesn't remove spaces and it's still faster than subst/regsub.