Port to Ruby

In an effort to be more 'Rubyist', I changed the DSL a bit.  Usage instructions here: https://github.com/ryan-endacott/VerbalExpressions.rb

I also haven't yet ported the modifier code.  Everything else should hopefully work though.  I also had to change a few keywords because they were reserved in Ruby (or, then)

verbal_expressions.rb

@@ -0,0 +1,137 @@
+# Ruby Verbal Expressions, based on the awesome JavaScript repo by @jehna: https://github.com/jehna/VerbalExpressions
+
+# For documentation and install instructions, 
+# see the main Ruby repo: https://github.com/ryan-endacott/VerbalExpressions.rb
+
+class VerEx < Regexp
+
+  def initialize(&block)
+    @prefixes = ""
+    @source = ""
+    @suffixes = ""
+    @modifiers = "" # TODO: Ruby Regexp option flags
+    @self_before_instance_eval = eval "self"
+    instance_eval &block
+    super(@prefixes + @source + @suffixes, @modifiers)
+  end
+
+  def method_missing(method, *args, &block)
+    @self_before_instance_eval.send method, *args, &block
+  end
+
+  # We try to keep the syntax as
+  # user-friendly as possible.
+  # So we can use the "normal"
+  # behaviour to split the "sentences"
+  # naturally.
+  # TODO: then is reserved in ruby, so use find or think of a better name
+  def find(value)
+    value = sanitize(value)
+    add("(#{value})")
+  end
+
+  # start or end of line
+
+  def start_of_line(enable = true)
+    @prefixes = '^' if enable
+  end
+
+  def end_of_line(enable = true)
+    @suffixes = '$' if enable
+  end
+
+  # Maybe is used to add values with ?
+  def maybe(value)
+    value = sanitize(value)
+    add("(#{value})?")
+  end
+
+  # Any character any number of times
+  def anything
+    add("(.*)")
+  end
+
+  # Anything but these characters
+  def anything_but(value)
+    value = sanitize(value)
+    add("([^#{value}]*)")
+  end
+
+  # Regular expression special chars
+
+
+  def line_break
+    add("(\\n|(\\r\\n))")
+  end
+
+  # And a shorthand for html-minded
+  alias_method :br, :line_break
+
+  def tab
+    add("\\t")
+  end
+
+  # Any alphanumeric
+  def word
+    add("\\w+")
+  end
+
+  # Any given character
+  def any_of(value)
+    value = sanitize(value)
+    add("[#{value}]")
+  end
+
+  alias_method :any, :any_of
+
+  # Usage: range( from, to [, from, to ... ] )
+  def range(*args)
+    value = "["
+    args.each_slice(2) do |from, to|
+      from = sanitize(from)
+      to = sanitize(to)
+      value += "#{from}-#{to}"
+    end
+    value += "]"
+    add(value)
+  end
+
+  # Loops
+
+  def multiple(value)
+    value = sanitize(value)
+    value += "+" unless ["+", "*"].include?(value.chars.first)
+    add(value)
+  end
+
+  # Adds alternative expressions
+  # TODO: or is a reserved keyword in ruby, think of better name
+  def alternatively(value = nil)
+    @prefixes += "(" unless @prefixes.include?("(")
+    @suffixes = ")" + @suffixes unless @suffixes.include?(")")
+    add(")|(")
+    find(value) if value
+  end
+
+  private
+
+    # Sanitation function for adding
+    # anything safely to the expression
+    def sanitize(value)
+      case value
+      when Regexp, VerEx
+        value.source
+      else
+        value.gsub(/([^\w])/) { "\\#{$1}" } # Escape non word chars
+      end
+    end
+
+    # Function to add stuff to the
+    # expression. Also compiles the
+    # new expression so it's ready to
+    # be used.
+    def add(value = '')
+      @source += value
+    end
+
+end