How to convert letters to UpperCase without uc() function?

Question

I'm trying to write a script which will convert all letters from lowercase to uppercase without using the uc() function.

Does it need to work with Unicode? – Bribles Jan 17 '13 at 15:31 — Bribles, Jan 17 '13 at 15:31
Why would you want to do that in the first place? – Zaid Jan 17 '13 at 15:38 — Zaid, Jan 17 '13 at 15:38
What's wrong with `uc` that it needs to be avoided? – ikegami Jan 17 '13 at 20:08 — ikegami, Jan 17 '13 at 20:08

score 6 · Accepted Answer · answered Jan 17 '13 at 15:31

6

You could use something like $str =~ tr/a-z/A-Z/, but uc is probably better for Unicode support, if it matters to you.

answered Jan 17 '13 at 15:31

dbrobins

score 5 · Answer 2 · answered Jan 17 '13 at 15:31

5

Using regular expressions:

$str =~ s/(.)/\u$1/g;

answered Jan 17 '13 at 15:31

Sean Bright

`\u` is titlecase, `\U` is uppercase (`uc()`). – TLP Jan 17 '13 at 16:45
1

`\u` is "uppercase the next character" and the substitution is run for each character. – Sean Bright Jan 17 '13 at 16:51
1

Note that this is just `uc` in disguise. – ikegami Jan 17 '13 at 20:07

2 Answers2