Specify Unicode Character in Regular Expression

Question

How can I create a ruby regular expression that includes a unicode character?

For example, I would like to the character "\u0002" in my regular expression.

Answer 1

You can write /\x02/ :

"\u0002" =~ /\x02/
#=> 0

If you're not sure, you can just start from a string :

Regexp.new("\u0002")
#=> /\x02/

Here's another example :

"☀☁☂" =~ /\u2602/
#=> 2

As mentionned by @TomLord in the comments, you can also specify a range. To check if a string includes a UTF-8 arrow :

"↹" =~ /[\u2190-\u21FF]/
#=> 0