in reply to can regex contains function?

> can regex contains function?

Yes, it can. That's what /e is for. 

$t =~ s/(?<=\s)(.)/uc $1/ge;

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But you don't need it here:

$t =~ s/(?<=\s)(.)/\U$1/g;

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map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In Section Seekers of Perl Wisdom