use strict;
my $str = 'Is there a way to do a find and replace (regex) all uppercase characters in the matching strings with lowercase ones? Preferably in VS Code or IntelliJ I already have my regex ready.';
my $regex = qr/(.*)/mp;
my $subst = '\\L\\1';
my $result = $str =~ s/$regex/$subst/rg;
print "The result of the substitution is' $result\n";
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Perl, please visit: http://perldoc.perl.org/perlre.html