Case conversion

collywobble has asked for the wisdom of the Perl Monks concerning the following question:

Replies are listed 'Best First'.
Re: Case conversion by spurperl (Priest) on Mar 31, 2003 at 07:44 UTC
Check the `uc` function. `perldoc -f uc` [download] For example: `perl -e 'print "hello " . uc "world"'` [download] Prints: hello WORLD...	[reply] [d/l] [select]
Re: Case conversion by Heidegger (Hermit) on Mar 31, 2003 at 07:45 UTC
Call the function `uc()`: `$i = uc($i);` [download] uc() in the manpage.	[reply] [d/l] [select]
Re: Case conversion by hotshot (Prior) on Mar 31, 2003 at 07:46 UTC
you can use function uc for that. another option is: `$var =~ tr/a-z/A-Z/;` [download] but the first way is better. Hotshot	[reply] [d/l]
Re: Case conversion by perlguy (Deacon) on Mar 31, 2003 at 15:57 UTC
You can also use `\U` and `\u` in a double quoted string. Such as: `my $i = 'hellO, worLd'; print "\U$i\n"; # All uppercase print "\L\u$i\n"; # All lowercase, except the 1st letter` [download]	[reply] [d/l] [select]
Re: Case conversion by Heidegger (Hermit) on Mar 31, 2003 at 07:49 UTC
The transliterate regexp (tr) once was very useful to me when I had to upper case Lithuanian characters in a web app. I could't make the Lithuanian perl locale work. So the transliterate was the only option.	[reply]
Re: Case conversion by collywobble (Initiate) on Mar 31, 2003 at 07:57 UTC
Thanks for the help. uc / lc was all I needed	[reply]
Re: Re: Case conversion by zby (Vicar) on Mar 31, 2003 at 08:33 UTC
And I really started to think that he needs case conversion in the name of the variable.	[reply]
Re: Case conversion by collywobble (Initiate) on Mar 31, 2003 at 07:48 UTC
I should probably phase this a bit better. I have a varible and this can be in either lower or upper case. For me to use this variable it needs to be in upper case. What I would like to achieve is to convert the variable to upper case if it is currently lower case otherwise just use it as it is. I hope that's better	[reply]
Re: Re: Case conversion by spurperl (Priest) on Mar 31, 2003 at 07:50 UTC
The simplest (and thus probably the desired) solution is to use `uc` anyway, it won't modify upper-case strings and will only turn lower-case to upper-case. Try: `perl -e 'print "hello " . uc "WOrld"'` [download]	[reply] [d/l]