add a regex matcher

docs/finding_data.markdown

@@ -10,6 +10,7 @@ The search object can take a few forms depending on what you want to find:
 {name: 'kevin'} // Will be expanded to is (see next line)
 {name: {is: 'kevin'}} // name is kevin
 {name: {isnot: 'kevin'}} // name is not kevin
+{name: {matches: /kev/}} // name matches the pattern /kev/
 {height: {gt: 100}} // height is greater than 100
 {height: {lt: 90}} // height is less than 90
 {eyes: {is: [1, 2]}} // eyes is 1 OR 2

src/compares.coffee

@@ -35,3 +35,7 @@ module.exports =
   includes: (field, value, objects) ->
     objects.filter (entry) ->
       (entry[field].indexOf(value) != -1)
+
+  matches: (field, value, objects) ->
+    objects.filter (entry) ->
+      (value.test entry[field])

tests/sodb-tests.coffee

@@ -99,6 +99,10 @@ for caching in [true, false]
         results = db.where({likes: {includes: 'bananas'}})
         expect(results.length).to.equal 4
 
+      it 'should support matches', ->
+        results = db.where({name: {matches: /kev/}})
+        expect(results.length).to.equal 1
+
     describe 'result manipulation', ->
       it 'should order by', ->
         ordered = db.order({name: {isnot: 'something new'}}, "age")