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    ^                 #    Match only if at start of string (or line)
    [ ]+              #    Match any of the listed characters, one-or-
+more times (as many as possible)
    Pin               #    Match a literal sequence ("Pin")
...
    [ ]*              #    Match any of the listed characters, zero-or
+-more times (as many as possible)
    out               #    Match a literal sequence ("out")

#    my $regstr = join '', 
#    # The regular expression (PPI::Token::Regexp::Match):
...
__END__
#PPIx::Regexp=HASH(0x178e4d4)
/^[ ]+Pin:[ ]*([^\.]*)\.([^ ]*)[ ]*out/