regex_lab.rb

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### Regex ###
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# Build regular expressions to match each of the following:
# 
# 1.  An IP address.  Use the format N.N.N.N, where each N is an Integer between
#     0 and 255.  Don't allow numbers outside that range.  There aren't always
#     three digits either.  For example, the loopback address for your computer
#     is 127.0.0.1.
# 
# 2.  Write a regular expression that hunts through free form text for URL's.
#     We will say a URL has to start with http://, https://, or ftp:// to count.
#     Do not match a trailing ., ?, or ! for URL's at the end of a sentence,
#     like this:  http://blog.grayproductions.net.
# 
# What do you think the following expression was built to match?

  /\A\d{3}-([A-Za-z\d]-?){6}[A-Za-z\d]\z/