From: "Mauricio Fernández" <batsman.geo@...>
Date: 2003-04-16T07:28:44+09:00
Subject: Re: regular expressions

On Wed, Apr 16, 2003 at 07:18:43AM +0900, Chris Pine wrote:
> Then I started thinking:  We have Perl-style regexps, right?  What other
> style regexps are there?  I'm sure people have come up with a number of
> different ideas, but a quick Google didn't turn up anything.  Does anyone
> know of any other ideas?

It seems to me you might like this:
http://mywebpages.comcast.net/mdschneider/ruby/index.html#REGTREE

Example:

# string to match
url_string = "myWebPages.comcast.net/mdschneider"

# build regex
word = RegexTree.init.word_char.plus_times
domain_element = word.capture_array("domains")
domain = (domain_element | '.').plus_times
url = domain + '/' + word.cast("user")

# match the string
url_match = url.match(url_string)

# extract the values
domains = url_match.value("domains").compact
user = url_match.value("user")

# display
puts
puts "URL path extraction demo:"
puts
puts "url_string:      #{url_string}"
puts "regex generated: #{url.render}"      # ==> ((?:[0-9A-Z_a-z]+|\.)+)/([0-9A-Z_a-z]+)
puts "domains found:   #{domains.inspect}" # ==> ["myWebPages","comcast", "net"]
puts "user found:      #{user.inspect}"    # ==> mdschneider


It all comes down to using some pseudo-EBNF notation. It is more
powerful than required for regexps, and far more verbose, but then
again, sometimes we just want that.


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