Smiles matcher

README.md

@@ -20,6 +20,7 @@ Regexy is the ruby gem that contains a lot of common-use regular expressions (su
     * [IP addresses](#regexywebipv4)
     * [Url](#regexyweburl)
     * [Hostname](#regexywebhostname)
+    * [Smiles](#regexytextsmile)
 - [Contributing](#contributing)
 
 ## Installation
@@ -137,6 +138,15 @@ Generates regular expressions for matching hostname (with unicode support).
 ```ruby
 r1 = Regexy::Web::HostName.new # matches 'foo.com', 'www.foo.com' and 'киррилический.домен.рф'
 ```
+### Regexy::Text::Smile
+
+Generates regular expressions for matching smiles.
+```ruby
+r = Regexy::Text::Smile.new # matches ':)', ':=)', 'xD' and so on
+# Find all smiles in text
+str = "Check out http://foo.com :). It's awesome :D"
+str.scan(r.unbound.internal_regexp).map(&:first) # => [":)", ":D"] 
+```
 
 ## Contributing
 Have an idea of new regular expression? Create an [issue](https://github.com/vladimir-tikhonov/regexy/issues) (some test cases will be much appreciated) or open a [pull request](https://github.com/vladimir-tikhonov/regexy/pulls).

lib/regexy.rb

@@ -1,7 +1,8 @@
 require 'regexy/version'
 
 module Regexy
-  autoload :Regexp, 'regexy/regexp'
+  autoload :Regexp,         'regexy/regexp'
   autoload :RegexpWithMode, 'regexy/regexp'
-  autoload :Web,    'regexy/web'
+  autoload :Web,            'regexy/web'
+  autoload :Text,           'regexy/text'
 end

lib/regexy/text.rb

@@ -0,0 +1,5 @@
+module Regexy
+  module Text
+    autoload :Smile, 'regexy/text/smile'
+  end
+end

lib/regexy/text/smile.rb

@@ -0,0 +1,11 @@
+module Regexy
+  module Text
+    class Smile < Regexy::Regexp
+      SMILE_REGEX = /\A((?<![\\:;x])[:8bx;][-=]?[dx\)\(0op\*\#s\\\/](?![\)\(\*\/\\\#]))\z/i
+
+      def initialize(*args)
+        super(SMILE_REGEX, *args)
+      end
+    end
+  end
+end

spec/text/smile_spec.rb

@@ -0,0 +1,35 @@
+describe Regexy::Text::Smile do
+  VALID_SMILES = [
+    ':)', ':=)', ':-)', ':(',
+    ':=(', ':-(', ':D', ':=D',
+    ':-D', ':d', ':=d', ':-d',
+    '8=)', '8-)', 'B=)', 'B-)',
+    ';)', ';-)', ';=)', ':o',
+    ':=o', ':-o', ':O', ':=O',
+    ':-O', ';(', ';-(', ';=(',
+    ':*', ':=*', ':-*', ':P',
+    ':=P', ':-P', ':p', ':=p',
+    ':-p', ':S', ':-S', ':=S',
+    ':s', ':-s', ':=s', ':x',
+    ':-X', ':#', ':-#', ':=x',
+    ':=X', ':=#', 'xd', ':\\', ':D', ':/'
+  ]
+
+  INVALID_SMILES = [
+    '://', '::)'
+  ]
+
+  let(:r) { Regexy::Text::Smile.new }
+
+  it 'accept valid smiles' do
+    VALID_SMILES.each do |smile|
+      expect(smile =~ r).to be_truthy
+    end
+  end
+
+  it 'does not accept invalid smiles' do
+    INVALID_SMILES.each do |smile|
+      expect(smile =~ r).to be_nil
+    end
+  end
+end