diff --git a/README.md b/README.md
index ce77612..228dc44 100644
--- a/README.md
+++ b/README.md
@@ -3,9 +3,9 @@
 
 [ ![Codeship Status for radekstepan/github-burndown-chart](https://www.codeship.io/projects/d69f4420-e5b0-0130-bbae-1632ddfb80f8/status?branch=rework)](https://www.codeship.io/projects/5855)
 
-##Next ->
+##Next
 
-[ ] Write tests to fetch open/closed issues (and save ourselves the trouble when milestone has 0 issues count)
+Map all issues matching a given regex label to their ids (for later update) and to individual days in the duration of a milestone.
 
 ##Project Charter
 
diff --git a/src/issues.coffee b/src/issues.coffee
index 4db8016..89f322f 100644
--- a/src/issues.coffee
+++ b/src/issues.coffee
@@ -32,4 +32,24 @@ module.exports =
         async.parallel [
             _.partial one_status, 'open'
             _.partial one_status, 'closed'
-        ], cb
\ No newline at end of file
+        ], cb
+
+    # Filter an array of incoming issues based on a regex.
+    'filter': (collection, regex, cb) ->
+        warnings = null
+        try
+            filtered = _.filter collection, ({ labels, number }) ->
+                number ?= '?'
+                return false unless labels
+                switch ( {} for { name } in labels when name and regex.test(name) ).length
+                    when 0 then false
+                    when 1 then true
+                    else
+                        warnings ?= []
+                        warnings.push "Issue ##{number} has multiple matching size labels"
+                        true
+            
+            cb null, warnings, filtered
+        
+        catch err
+            return cb err, warnings
\ No newline at end of file
diff --git a/test/issues.coffee b/test/issues.coffee
index 48e6666..44991f3 100644
--- a/test/issues.coffee
+++ b/test/issues.coffee
@@ -141,4 +141,44 @@ module.exports =
         issues.get_all {}, (err, [ open, closed ]) ->
             assert.equal err, 'Not Found'
             assert.equal called, 1
+            done.call null
+
+    'filter on existing label regex': (done) ->
+        issues.filter [ { labels: [ { name: 'size 5' } ] } ]
+        , /size (\d)+$/, (err, warn, data) ->
+            assert.ifError err
+            assert.ifError warn
+            assert.equal data.length, 1
+            done.call null
+
+    'filter when no labels': (done) ->
+        issues.filter [ { } ]
+        , /size (\d)+$/, (err, warn, data) ->
+            assert.ifError err
+            assert.ifError warn
+            assert.equal data.length, 0
+            done.call null
+
+    'filter when empty labels': (done) ->
+        issues.filter [ { labels: [] } ]
+        , /size (\d)+$/, (err, warn, data) ->
+            assert.ifError err
+            assert.ifError warn
+            assert.equal data.length, 0
+            done.call null
+
+    'filter when not matching regex': (done) ->
+        issues.filter [ { labels: [ { name: 'size 1A' } ] } ]
+        , /size (\d)+$/, (err, warn, data) ->
+            assert.ifError err
+            assert.ifError warn
+            assert.equal data.length, 0
+            done.call null
+
+    'filter when multiple match the regex': (done) ->
+        issues.filter [ { labels: [ { name: 'size 1' }, { name: 'size 6' } ] } ]
+        , /size (\d)+$/, (err, warn, data) ->
+            assert.ifError err
+            assert.equal warn.length, 1
+            assert.equal data.length, 1
             done.call null
\ No newline at end of file