From: tamouse mailing lists <tamouse.lists@...>
Date: 2013-02-04T20:10:00+09:00
Subject: Re: Character classes use in Ruby

On Mon, Feb 4, 2013 at 4:59 AM, Love U Ruby <lists@ruby-forum.com> wrote:
> Hans Mackowiak wrote in post #1095104:
>> my-ruby:
>> did you even try to google that list?
>> http://ruby-doc.org/core-1.9.3/Regexp.html
>>
>>
>> /[[:alnum:]]/ - Alphabetic and numeric character
>> /[[:alpha:]]/ - Alphabetic character
>> /[[:blank:]]/ - Space or tab
>> /[[:cntrl:]]/ - Control character
>> /[[:digit:]]/ - Digit
>
> I know their description - but would be good for me if I get a ruby tiny
> code to see their uses. Mainly how syntactically are they
> used,basically.

Read the page Hans pointed you to:

/[[:upper:]][[:lower:]]/.match("Hello") #=> #<MatchData "He">