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Posted by PerlFAQ Server on February 27, 2008, 9:03 am
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This is an excerpt from the latest version perlfaq4.pod, which
comes with the standard Perl distribution. These postings aim to
reduce the number of repeated questions as well as allow the community
to review and update the answers. The latest version of the complete
perlfaq is at http://faq.perl.org .
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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
)
/\U$1/xg;
$string =~ s/([\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
transformations:
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";
}
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