FAQ 4.30 How do I capitalize all the words on one line?

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4.30: How do I capitalize all the words on one line?

    (contributed by brian d foy)

    Damian Conway's Text::Autoformat handles all of the thinking for you.

            use Text::Autoformat;
            my $x = "Dr. Strangelove or: How I Learned to Stop ".
              "Worrying and Love the Bomb";

            print $x, "\n";
            for my $style (qw( sentence title highlight )) {
                    print autoformat($x, { case => $style }), "\n";

    How do you want to capitalize those words?

            FRED AND BARNEY'S LODGE        # all uppercase
            Fred And Barney's Lodge        # title case
            Fred and Barney's Lodge        # highlight case

    It's not as easy a problem as it looks. How many words do you think are
    in there? Wait for it... wait for it.... If you answered 5 you're right.
    Perl words are groups of "\w+", but that's not what you want to
    capitalize. How is Perl supposed to know not to capitalize that "s"
    after the apostrophe? You could try a regular expression:

            $string =~ s/ (
                                     (^\w)    #at the beginning of the line
                                       |      # or
                                     (\s\w)   #preceded by whitespace

            $string =~ s/([\w']+)/\u\L$1/g;

    Now, what if you don't want to capitalize that "and"? Just use
    Text::Autoformat and get on with the next problem. :)


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