diff --git a/app/assets/javascripts/core.js.coffee b/app/assets/javascripts/core.js.coffee
index 8484708..e55a9eb 100644
--- a/app/assets/javascripts/core.js.coffee
+++ b/app/assets/javascripts/core.js.coffee
@@ -71,6 +71,20 @@ class hQuery.CodedValue
             return true
     return false
 
+  ###*
+  Returns true if the contained code and codeSystemName match a code in the supplied codeSet.
+  @param {Object} codeSet a hash with code system names as keys and an array of codes (provided as regular expressions) as values
+  @returns {boolean}
+  ###
+  regex_includedIn: (codeSet) ->
+    for codeSystemName, codes of codeSet
+      if @csn==codeSystemName
+        for code in codes
+          regex = RegExp(code,"i")
+          if regex.test(@c)
+            return true
+    return false
+
 ###*
 Status as defined by value set 2.16.840.1.113883.5.14,
 the ActStatus vocabulary maintained by HL7
@@ -437,6 +451,17 @@ class hQuery.CodedEntry
         return true
     return false
 
+  ###*
+  Returns true if any of this entry codes match a code in the supplied codeSet.
+  @param {Object} codeSet a hash with code system names as keys and an array of codes (provided as regular expressions) as values
+  @returns {boolean}
+  ###
+  regex_includesCodeFrom: (codeSet) ->
+    for codedValue in @_type
+      if codedValue.regex_includedIn(codeSet)
+        return true
+    return false
+
   ###*
   @returns {Boolean} whether the entry was negated
   ###
@@ -507,6 +532,26 @@ class hQuery.CodedEntryList extends Array
         cloned.push(entry)
     cloned
 
+  ###*
+  Return the number of entries that match the
+  supplied code set where those entries occur between the supplied time bounds
+  @param {Object} codeSet a hash with code system names as keys and an array of codes (provided as regular expressions) as values
+  @param {Date} start the start of the period during which the entry must occur, a null value will match all times
+  @param {Date} end the end of the period during which the entry must occur, a null value will match all times
+  @param {boolean} includeNegated whether the returned list of entries should include those that have been negated
+  @return {CodedEntryList} the matching entries
+  TODO - decide on what to do with includeNegated parameter
+  ###
+  regex_match: (codeSet, start, end, includeNegated=false) ->
+    cloned = new hQuery.CodedEntryList()
+    for entry in this
+      afterStart = (!start || entry.timeStamp()>=start)
+      beforeEnd = (!end || entry.timeStamp()<=end)
+      matchesCode = codeSet == null || entry.regex_includesCodeFrom(codeSet)
+      if (afterStart && beforeEnd && matchesCode && (includeNegated || !entry.negationInd()))
+        cloned.push(entry)
+    cloned
+
   ###*
   Return a new list of entries that is the result of concatenating the passed in entries with this list
   @return {CodedEntryList} the set of concatenated entries
diff --git a/test/unit/patient_api_test.rb b/test/unit/patient_api_test.rb
index 9c35a7e..69ddef6 100644
--- a/test/unit/patient_api_test.rb
+++ b/test/unit/patient_api_test.rb
@@ -81,6 +81,7 @@ def test_procedures
     assert_equal 'Colonscopy', @context.eval('patient.procedures()[0].freeTextType()')
     assert @context.eval('patient.procedures()[0].includesCodeFrom({"CPT": ["44388"]})')
     assert_equal 1, @context.eval('patient.procedures().match({"CPT": ["44388"]}).length')
+    assert_equal 1, @context.eval('patient.procedures().regex_match({"CPT": ["4438.*"]}).length')
     assert_equal 0, @context.eval('patient.procedures().match({"CPT": ["44388"]}, sampleDate).length')
     assert_equal 'SNOMED-CT', @context.eval('patient.procedures()[0].site().codeSystemName()')
     assert_equal '71854001', @context.eval('patient.procedures()[0].site().code()')
@@ -198,4 +199,4 @@ def test_medical_equipment
     assert_equal '13648007', @context.eval('patient.medicalEquipment()[0].anatomicalStructure().code()')
   end
   
-end
\ No newline at end of file
+end