From: "Jan E." <lists@...>
Date: 2013-02-04T19:36:07+09:00
Subject: Re: Character classes use in Ruby

Hi,

aren't those names self-explanatory?

alnum = alphanumeric = a letter of any alphabet or a digit (a, Щ, 1, 
...)
space = spaces, tabs, newlines, ...
xdigit = hexadecimal digit (a-zA-Z0-9)

etc.

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