Regex searches are case-sensitive if any letter is capitalized.

Fixes bug introduced in commit aa3f674948

spec/extensions/command-interpreter-spec.coffee

@@ -163,19 +163,25 @@ describe "CommandInterpreter", ->
 
       it "is case-insentive when the pattern contains no non-escaped uppercase letters (behavior copied from vim)", ->
         waitsForPromise ->
-          editSession.setSelectedBufferRange([[4,16], [4,20]])
           interpreter.eval('/array', editSession)
-
         runs ->
-          expect(editSession.getSelection().getBufferRange()).toEqual [[11,14], [11,19]]
+          expect(interpreter.lastRelativeAddress.subcommands[0].regex.toString()).toEqual "/array/i"
 
         waitsForPromise ->
-          editSession.setSelectedBufferRange([[4,16], [4,20]])
-          interpreter.eval('/a\\Sray', editSession) # You must escape the backslash, otherwise it is treated as an escaped 'S'
-
+          interpreter.eval('/a\\Sray', editSession)
         runs ->
-          expect(editSession.getSelection().getBufferRange()).toEqual [[11,14], [11,19]]
+          expect(interpreter.lastRelativeAddress.subcommands[0].regex.toString()).toEqual "/a\\Sray/i"
 
+      it "is case-sentive when the pattern contains a non-escaped uppercase letters (behavior copied from vim)", ->
+        waitsForPromise ->
+          interpreter.eval('/arRay', editSession)
+        runs ->
+          expect(interpreter.lastRelativeAddress.subcommands[0].regex.toString()).toEqual "/arRay/"
+
+        waitsForPromise ->
+          interpreter.eval('/Array', editSession)
+        runs ->
+          expect(interpreter.lastRelativeAddress.subcommands[0].regex.toString()).toEqual "/Array/"
 
     describe "address range", ->
       describe "when two addresses are specified", ->

src/extensions/command-panel/commands/regex-address.coffee

@@ -10,7 +10,7 @@ class RegexAddress extends Address
     flags = ""
     pattern = pattern.source if pattern.source
 
-    patternContainsCapitalLetter = /[^\\][A-Z]/.test(pattern)
+    patternContainsCapitalLetter = /(^|[^\\])[A-Z]/.test(pattern)
     flags += "i" unless patternContainsCapitalLetter
     @isReversed = isReversed