add regular expression support

README.md

@@ -69,6 +69,17 @@ class EloquentPokerPlayer < ActiveRecord::Base
 end
 ```
 
+### Using `regex`
+
+```ruby
+class User < ActiveRecord::Base
+  # Strip off characters defined by RegEx
+  strip_attributes :only => [:first_name, :last_name], :regex => /[^[:alpha:]\s]/
+  # Strip off non-integers
+  strip_attributes :only => [:phone], :regex => /[^0-9]/
+end
+```
+
 ## Usage Patterns
 
 ### Other ORMs implementing `ActiveModel`

lib/strip_attributes.rb

@@ -19,7 +19,7 @@ def strip_attributes!(options = nil)
 end
 
 module StripAttributes
-  VALID_OPTIONS = [:only, :except, :allow_empty, :collapse_spaces]
+  VALID_OPTIONS = [:only, :except, :allow_empty, :collapse_spaces, :regex]
 
   # Necessary because Rails has removed the narrowing of attributes using :only
   # and :except on Base#attributes
@@ -41,6 +41,7 @@ def self.strip(record, options)
       if options
         allow_empty     = options[:allow_empty]
         collapse_spaces = options[:collapse_spaces]
+        regex           = options[:regex]
       end
 
       attributes.each do |attr, value|
@@ -53,6 +54,10 @@ def self.strip(record, options)
         if collapse_spaces && value.respond_to?(:squeeze!)
           value.squeeze!(' ')
         end
+
+        if regex && value.respond_to?(:gsub!)
+          value.gsub!(regex, '')
+        end
 
         record[attr] = value if original_value != value
       end

test/strip_attributes_test.rb

@@ -56,6 +56,11 @@ class CoexistWithOtherValidations < Tableless
   }
 end
 
+class StripRegexMockRecord < Tableless
+  include MockAttributes
+  strip_attributes :regex => /[\^\%&\*]/
+end
+
 class StripAttributesTest < MiniTest::Unit::TestCase
   def setup
     @init_params = { :foo => "\tfoo", :bar => "bar \t ", :biz => "\tbiz ", :baz => "", :bang => " ", :foz => " foz  foz" }
@@ -169,4 +174,12 @@ def test_should_coexist_with_other_validations
     # assert record.valid?, "Expected record to be valid, but got #{record.errors.full_messages}"
     # assert !record.errors.include?(:number), "Expected record to have no errors on :number"
   end
+
+  def test_should_strip_regex
+    record = StripRegexMockRecord.new
+    record.assign_attributes(@init_params.merge(:foo => "^%&*abc  "))
+    record.valid?
+    assert_equal "abc",        record.foo
+    assert_equal "bar",        record.bar
+  end  
 end