diff --git a/lib/string_tools/core_ext/string.rb b/lib/string_tools/core_ext/string.rb
index cd35425..68ae152 100644
--- a/lib/string_tools/core_ext/string.rb
+++ b/lib/string_tools/core_ext/string.rb
@@ -39,12 +39,119 @@ def naturalized
     scan(/[^\d\.]+|[\d\.]+/).map{|f| f.match(/^\d+(\.\d+)?$/) ? f.to_f : f }
   end
 
+  def self.natcmp(str1, str2)
+    str1, str2 = str1.dup, str2.dup
+    compare_expression = /^(\D*)((?:\d+(?:\.\d+)?)*)(.*)$/
+
+    # Remove all whitespace
+    str1.gsub!(/\s*/, '')
+    str2.gsub!(/\s*/, '')
+
+    while (str1.length > 0) or (str2.length > 0)
+      # Extract non-digits, digits and rest of string
+      str1 =~ compare_expression
+      chars1, num1, str1 = $1.dup, $2.dup, $3.dup
+
+      str2 =~ compare_expression
+      chars2, num2, str2 = $1.dup, $2.dup, $3.dup
+
+      # Compare the non-digits
+      case (chars1 <=> chars2)
+      when 0 # Non-digits are the same, compare the digits...
+        # If either number begins with a zero, then compare alphabetically,
+        # otherwise compare numerically
+        if !(num1[0] == 48 && num1[1] != 46) and !(num2[0] == 48 && num2[1] != 46)
+          num1, num2 = num1.to_f, num2.to_f
+        end
+
+        case (num1 <=> num2)
+        when -1 then return -1
+        when 1 then return 1
+        end
+      when -1 then return -1
+      when 1 then return 1
+      end # case
+
+    end # while
+
+    # Strings are naturally equal
+    0
+  end
 
   # Выполняет преобразование строки в punycode.
   def to_punycode
     Addressable::URI.parse(self).normalize.to_s
   end
 
+  # Embed in a String to clear all previous ANSI sequences.
+  ANSI_CLEAR     = "\e[0m"
+  ANSI_BOLD      = "\e[1m"
+  ANSI_UNDERLINE = "\e[4m"
+
+  # Colors
+  BLACK     = "\e[30m"
+  RED       = "\e[31m"
+  GREEN     = "\e[32m"
+  YELLOW    = "\e[33m"
+  BLUE      = "\e[34m"
+  MAGENTA   = "\e[35m"
+  CYAN      = "\e[36m"
+  WHITE     = "\e[37m"
+
+  # === Synopsys
+  #   Colorize string (for terminals)
+  #   Does not work with sprintf yet
+  #
+  # === Usage
+  #   "ln -s".colorize(:red)
+  #
+  # === Args
+  #   +color+ - symbol, one of the following (black, white, red, green, yellow, blue, magenta, cyan)
+  #   +bold_or_options+ - True/False or Hash
+  def colorize(color, bold_or_options = nil)
+    is_bold      = bold_or_options.is_a?(TrueClass)
+    is_underline = false
+
+    if bold_or_options.is_a?(Hash)
+      is_bold    ||= bold_or_options[:bold]
+      is_underline = bold_or_options[:underline]
+    end
+
+    raise ArgumentError('Color must be a symbol') unless color.is_a?(Symbol)
+    color_const = color.to_s.upcase.to_sym
+
+    raise ArgumentError('Unknown color') unless self.class.const_defined?(color_const)
+    ascii_color = self.class.const_get(color_const)
+
+    s = surround_with_ansi(ascii_color)
+    s = s.bold      if is_bold
+    s = s.underline if is_underline
+    s
+  end
+
+  # === Synopsys
+  #   Make text bolder (for ASCII terminals)
+  def bold
+    surround_with_ansi(ANSI_BOLD)
+  end
+
+  # === Synopsys
+  #   Make text underlined (for ASCII terminals)
+  def underline
+    surround_with_ansi(ANSI_UNDERLINE)
+  end
+
+  # === Synopsys
+  #   remove colors from colorized string
+  def remove_colors
+    gsub(/\e\[\d+m/, '')
+  end
+
+  [:black, :white, :red, :green, :yellow, :blue, :magenta, :cyan].each do |color|
+    define_method color do |*args|
+      colorize(color, *args)
+    end
+  end
 
   # shorthand
   def detect_encoding
@@ -84,4 +191,14 @@ def to_cp1251
   def to_cp1251!
     self.replace(self.to_cp1251)
   end
+
+  private
+
+  def surround_with_ansi(ascii_seq)
+    "#{ascii_seq}#{protect_escape_of(ascii_seq)}#{ANSI_CLEAR}"
+  end
+
+  def protect_escape_of(ascii_seq)
+    gsub(Regexp.new(Regexp.escape(ANSI_CLEAR)), "#{ANSI_CLEAR}#{ascii_seq}")
+  end
 end