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Class for email addresses / regex for splitting and checking
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):
   • Ruby - examples of regular expressions, inheritance and polymorphism - [link]

Source code: pareea Module: R109

# Regular expressions for email addresses

class Email
        def initialize(address)
                @raw = address.strip
                @valid = nil
                if @raw =~ /(\S+)@(\S+)/
                        @domain = $2
                        @user = $1
                        @domparts = splitdomain(@domain)
                        @valid = 1 if @domparts

        def splitdomain(dom)
                domp = dom.split(".")

                # Look for errors!
                return nil if domp.length < 2
                domp.each do |dnp|
                        return nil if ! (dnp.downcase =~ /^[-a-z0-9]+$/)
                return nil if domp[-1].length < 2 or domp[-1].length > 6
                return nil unless domp[-1].downcase =~ /^[a-z]+$/

                return domp

        def to_s
                if @valid
                        return "#{@domain} and #{@user} #{@domparts.join("!")}"
                        return "INVALID -> #{@raw}"


if __FILE__ == $0

        sample = ["graham@sheepbingo.co.uk" ,
                "graham123@wellho.com" ,
                "404, The Spa, Melksham",
                ",@123test.com" ,
                "ship@shape.rectangle" ,

        tests = []

# create an array of objects

        sample.each do |emma|
                tests.push Email.new(emma)

# Print out the details of each object

        tests.each do |emma|
                puts emma



Sample output:

wizard:r11 graham$ ruby pareea
sheepbingo.co.uk and graham sheepbingo!co!uk
wellho.com and graham123 wellho!com
INVALID -> 404, The Spa, Melksham
INVALID -> graham@wizard
123test.com and , 123test!com
INVALID -> ship@shape.rectangle
alias.smith.net and j.smith+r.jones alias!smith!net
wizard:r11 graham$

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

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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.

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