Add tests to traverseRegexMatchesInRange

spec/atom/buffer-spec.coffee

@@ -243,6 +243,41 @@ describe 'Buffer', ->
         expect(matches[2][1]).toBe 'rr'
         expect(ranges[2]).toEqual [[6,34], [6,41]]
 
+    describe "when the last regex match exceeds the end of the range", ->
+      describe "when the portion of the match within the range also matches the regex", ->
+        it "calls the iterator with the truncated match", ->
+          matches = []
+          ranges = []
+          buffer.traverseRegexMatchesInRange /cu(r*)/g, [[4,0], [6,9]], (match, range) ->
+            matches.push(match)
+            ranges.push(range)
+
+          expect(matches.length).toBe 2
+          expect(ranges.length).toBe 2
+
+          expect(matches[0][0]).toBe 'curr'
+          expect(matches[0][1]).toBe 'rr'
+          expect(ranges[0]).toEqual [[5,6], [5,10]]
+
+          expect(matches[1][0]).toBe 'cur'
+          expect(matches[1][1]).toBe 'r'
+          expect(ranges[1]).toEqual [[6,6], [6,9]]
+
+      describe "when the portion of the match within the range does not matches the regex", ->
+        it "calls the iterator with the truncated match", ->
+          matches = []
+          ranges = []
+          buffer.traverseRegexMatchesInRange /cu(r*)e/g, [[4,0], [6,9]], (match, range) ->
+            matches.push(match)
+            ranges.push(range)
+
+          expect(matches.length).toBe 1
+          expect(ranges.length).toBe 1
+
+          expect(matches[0][0]).toBe 'curre'
+          expect(matches[0][1]).toBe 'rr'
+          expect(ranges[0]).toEqual [[5,6], [5,11]]
+
     describe "when the iterator calls the 'replace' control function with a replacement string", ->
       it "replaces each occurrence of the regex match with the string", ->
         ranges = []

src/atom/buffer.coffee

@@ -158,7 +158,7 @@ class Buffer
 
       if matchEndIndex > endIndex
         regex.lastIndex = 0
-        if matchStartIndex < endIndex and match = regex.exec(text[matchStartIndex..endIndex])
+        if matchStartIndex < endIndex and match = regex.exec(text[matchStartIndex...endIndex])
           matchLength = match[0].length
           matchEndIndex = matchStartIndex + matchLength
         else