Use reject instead of delete_if

README.markdown

@@ -263,7 +263,11 @@ Takes a resource reference and an optional hash of attributes. Returns 'true' if
 
 #### `delete`
 
-Deletes all instances of a given element from an array, substring from a string, or key from a hash. For example, `delete(['a','b','c','b'], 'b')` returns ['a','c']; `delete('abracadabra', 'bra')` returns 'acada'. `delete({'a' => 1,'b' => 2,'c' => 3},['b','c'])` returns {'a'=> 1}. *Type*: rvalue.
+Deletes all instances of a given element from an array, substring from a string, or key from a hash. Arrays and hashes may also match on regular expressions by providing a full regular expression.
+
+For example, `delete(['a','b','c','b'], 'b')` returns ['a','c']; `delete('abracadabra', 'bra')` returns 'acada'. `delete({'a' => 1,'b' => 2,'c' => 3},['b','c'])` returns {'a'=> 1}, `delete(['abf', 'ab', 'ac'], '^ab.*')` returns ['ac']. `delete(['ab', 'b'], 'b')` returns ['ab'].
+
+*Type*: rvalue.
 
 #### `delete_at`
 

lib/puppet/parser/functions/delete.rb

@@ -2,8 +2,6 @@
 # delete.rb
 #
 
-# TODO(Krzysztof Wilczynski): We need to add support for regular expression ...
-
 module Puppet::Parser::Functions
   newfunction(:delete, :type => :rvalue, :doc => <<-EOS
 Deletes all instances of a given element from an array, substring from a
@@ -22,19 +20,23 @@ module Puppet::Parser::Functions
 
     delete('abracadabra', 'bra')
     Would return: 'acada'
+
+    delete(['abracadabra'], '^.*bra.*$')
+    Would return: []
+
+    delete(['abracadabra'], '^.*jimbob.*$')
+    Would return: ['abracadabra']
   EOS
   ) do |arguments|
 
-    if (arguments.size != 2) then
-      raise(Puppet::ParseError, "delete(): Wrong number of arguments "+
-                                  "given #{arguments.size} for 2.")
-    end
+    raise(Puppet::ParseError, "delete(): Wrong number of arguments "+
+                              "given #{arguments.size} for 2") unless arguments.size == 2
 
     collection = arguments[0].dup
     Array(arguments[1]).each do |item|
       case collection
         when Array, Hash
-          collection.delete item
+          collection.reject! { |coll_item| (coll_item =~ %r{\b#{item}\b}) }
         when String
           collection.gsub! item, ''
         else

spec/functions/delete_spec.rb

@@ -4,6 +4,7 @@
   it { is_expected.not_to eq(nil) }
   it { is_expected.to run.with_params().and_raise_error(Puppet::ParseError) }
   it { is_expected.to run.with_params([]).and_raise_error(Puppet::ParseError) }
+  it { is_expected.to run.with_params([], 'two') }
   it { is_expected.to run.with_params([], 'two', 'three').and_raise_error(Puppet::ParseError) }
   it { is_expected.to run.with_params(1, 'two').and_raise_error(TypeError) }
 
@@ -12,11 +13,15 @@
     it { is_expected.to run.with_params([], 'two').and_return([]) }
     it { is_expected.to run.with_params(['two'], 'two').and_return([]) }
     it { is_expected.to run.with_params(['two', 'two'], 'two').and_return([]) }
+    it { is_expected.to run.with_params(['one', 'two', 'three'], '^t.*').and_return(['one']) }
+    it { is_expected.to run.with_params(['ab', 'b', 'c', 'b'], 'b').and_return(['ab', 'c']) }
     it { is_expected.to run.with_params(['one', 'two', 'three'], 'four').and_return(['one', 'two', 'three']) }
     it { is_expected.to run.with_params(['one', 'two', 'three'], 'e').and_return(['one', 'two', 'three']) }
     it { is_expected.to run.with_params(['one', 'two', 'three'], 'two').and_return(['one', 'three']) }
     it { is_expected.to run.with_params(['two', 'one', 'two', 'three', 'two'], 'two').and_return(['one', 'three']) }
     it { is_expected.to run.with_params(['one', 'two', 'three', 'two'], ['one', 'two']).and_return(['three']) }
+    it { is_expected.to run.with_params(['abracadabra'], 'abr').and_return(['abracadabra']) }
+    it { is_expected.to run.with_params(['abracadabra'], '^.*jimbob.*$').and_return(['abracadabra']) }
   end
 
   describe 'deleting from a string' do