Question

I have an UTF-8 string, which might be in any language.

How do I check, if it does not contain any non-alphanumeric characters?

I could not find such method in UnicodeUtils Ruby gem.

Examples:

1. ėččę91 – valid
2. $120D – invalid

Answer 1

You can use the POSIX notation for alpha-numerics:

#!/usr/bin/env ruby -w
# encoding: UTF-8

puts RUBY_VERSION

valid = "ėččę91"
invalid = "$120D"

puts valid[/[[:alnum:]]+/]
puts invalid[/[^[:alnum:]]+/]

Which outputs:

1.9.2
ėččę91
$