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search, search / replace, search / execute / replace
Strings and Regular Expressions example from a Well House Consultants training course
More on Strings and Regular Expressions [link]

This example is described in the following article(s):
   • Matching regular expressions, and substitutions, in Ruby - [link]

Source code: finder Module: R109

# search, search / replace, search / execute / replace

# This example reads a web server log file, extracts all the hits which
# are arrivals from Google searches, and tablulates them. It's a demonstration
# of regular expressions from our Ruby course, and it also shows a hash of
# arrays, sorting, and other features.

arrivals = {}

for lyne in (File.new "ac_20120221").readlines
        parts = lyne.split
        calledfor = parts[6]
        referer = parts[10]
        # puts "#{calledfor} - #{referer}"

        if referer =~ /\.google\..*[?&]q=([^&"]*)/
                # puts "#{calledfor} search arrival for #{$1}"
                query = $1

        # Following two lines would be good as a function - URL decoding

                query.tr! '+', ' '
                query = query.gsub(/%(..)/) { "%c" % $1.to_i(16) }

                # puts "#{calledfor} search arrival for #{query}"

        # Make me an empty container if this is the first time Google has
        # sent someone here

                if arrivals[calledfor] == nil
                        arrivals[calledfor] = []
                end

        # Add in the query that was used into that empty container

                if query == ""
                        # print "#{$.} lyne"
                        # To add - act on empty queries (what are they?)
                else
                        arrivals[calledfor].push query
                end

        end

end

# List out all the pages that were arrived at, and a count of arrival numbers

for landingplace in arrivals.keys
        numberofarrivals = arrivals[landingplace].length
        puts "#{numberofarrivals} to #{landingplace}"
        end

# What were all the requests for popular pages?

for landingplace in arrivals.keys
        numberofarrivals = arrivals[landingplace].length
        if numberofarrivals > 30
                arrivals[landingplace].sort!
                puts "Arrived at #{landingplace} from"
                for arr_string in arrivals[landingplace]
                        puts " .......... #{arr_string}"
                end
        end
end

puts "Analysis was of #{$.} lines"
Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in Ruby
 * Ruby Programming
Also available on on site courses for larger groups

Books covering this topic
Yes. We have over 700 books in our library. Books covering Ruby are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "Strings and Regular Expressions" training module. You'll find a description of the topic and some other closely related examples on the "Strings and Regular Expressions" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
• Our Opentalk forum archive provides a question and answer centre.
The Horse's mouth provides a daily tip or thought.
• Further resources are available via the resources centre.
• All of these resources can be searched through through our search engine
• And there's a global index here.

Purpose of this website
This is a sample program, class demonstration or answer from a training course. It's main purpose is to provide an after-course service to customers who have attended our public private or on site courses, but the examples are made generally available under conditions described below.

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This web site is written and maintained by Well House Consultants.

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