℞ 5: Unicode literals by character number In an interpolated literal, whether a double-quoted string or a regex, you may specify a character by its number using the \x{HHHHHH} escape. String: "\x{3a3}" Regex: /\x{3a3}/ String: "\x{1d45b}" Regex: /\x{1d45b}/ # even…
℞ 4: Characters and their numbers Do you need to translate a codepoint to a character or a character to its codepoint? The ord and chr functions work transparently on all codepoints, not just on ASCII alone—nor in fact, not…
℞ 3: Declare source in UTF-8 for identifiers and literals Without the all-critical use utf8 declaration, putting UTF‑8 in your literals and identifiers won’t work right. If you used the standard Perl Unicode preamble, this already happened. If you did,…
℞ 2: Fine-tuning Unicode warnings It’s easy to get Unicode wrong, especially when handling user input and dealing with multiple encodings. Perl is happy to help you detect unexpected conditions of your data. Perl is also happy to let you…
To handle Unicode effectively, always decompose on the way in, then recompose on the way out.
Tom Christiansen demonstrates the bare minimum feature set necessary to work with Unicode effectively in Perl 5.
In this excerpt from Programming Perl 4e, Tom Christiansen demonstrates that, in a Unicode world, sorting correctly can be trickier than you think.
Editor’s note: The new edition of Perl Cookbook has released, so this week we continue to highlight recipes-new to the second edition-for your sampling pleasure. This week’s excerpts include recipes from Chapter 14 (“Database Access”) and Chapter 18 (“Internet…
Editor’s note: The new edition of Perl Cookbook is about to hit store shelves, so to trumpet its release, we offer some recipes-new to the second edition-for your sampling pleasure. This week’s excerpts include recipes from Chapter 6 (“Pattern…
Lawyers, Liars, and Perl As the clock draws us relentlessly closer toward 2000, the final year of the second millennium, doom sayers everywhere are prophesying unprecedented computer failure in every conceivable sector. Known popularly as the Year 2000 Problem,…
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