Since no one else has mentioned it yet, here is an example that uses the SlashG anchor. (SlashG is typed like that just to make it search-engine-distinguishable).

$_ = "ThisIsACamelCaseWorld";
my  @aTemp;
@aTemp =  m/\G[A-Z]?[a-z]*/g;          ## same thing
print join " ", @aTemp;

__END__
This Is A Camel Case World
[download]