Try this, it's a little different, though it only works on leading whitespace:
s/\G //g
<paraphrase>
It uses the \G anchor with the /g flag to start where the previous match left off, replacing spaces with nothing as it goes along.
</paraphrase>
It's from p. 245 of Effective Perl Programming by Joseph N. Hall and Randal Schwartz (merlyn).
Randal, if there's a problem with me quoting this stuff, just let me know.
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