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

Do you have a question? Post it now! No Registration Necessary.  Now with pictures!

This message is one of several periodic postings to comp.lang.perl.misc
intended to make it easier for perl programmers to find answers to
common questions. The core of this message represents an excerpt
from the documentation provided with Perl.


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

    To make the first letter of each word upper case:

            $line =~ s/\b(\w)/\U$1/g;

    This has the strange effect of turning ""don't do it"" into ""Don'T Do
    It"". Sometimes you might want this. Other times you might need a more
    thorough solution (Suggested by brian d foy):

        $string =~ s/ (
                     (^\w)    #at the beginning of the line
                       |      # or
                     (\s\w)   #preceded by whitespace
        $string =~ /([\w']+)/\u\L$1/g;

    To make the whole line upper case:

            $line = uc($line);

    To force each word to be lower case, with the first letter upper case:

            $line =~ s/(\w+)/\u\L$1/g;

    You can (and probably should) enable locale awareness of those
    characters by placing a "use locale" pragma in your program. See
    perllocale for endless details on locales.

    This is sometimes referred to as putting something into "title case",
    but that's not quite accurate. Consider the proper capitalization of the
    movie *Dr. Strangelove or: How I Learned to Stop Worrying and Love the
    Bomb*, for example.

    Damian Conway's Text::Autoformat module provides some smart case

        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";


Documents such as this have been called "Answers to Frequently
Asked Questions" or FAQ for short.  They represent an important
part of the Usenet tradition.  They serve to reduce the volume of
redundant traffic on a news group by providing quality answers to
questions that keep coming up.

If you are some how irritated by seeing these postings you are free
to ignore them or add the sender to your killfile.  If you find
errors or other problems with these postings please send corrections
or comments to the posting email address or to the maintainers as
directed in the perlfaq manual page.

Note that the FAQ text posted by this server may have been modified
from that distributed in the stable Perl release.  It may have been
edited to reflect the additions, changes and corrections provided
by respondents, reviewers, and critics to previous postings of
these FAQ. Complete text of these FAQ are available on request.

The perlfaq manual page contains the following copyright notice.


    Copyright (c) 1997-2002 Tom Christiansen and Nathan
    Torkington, and other contributors as noted. All rights

This posting is provided in the hope that it will be useful but
does not represent a commitment or contract of any kind on the part
of the contributers, authors or their agents.

Site Timeline