Match $ in command regexes as end of line. Don't infinitely loop on substituting zero-width matches

src/atom/command-interpreter/address.coffee

@@ -3,6 +3,8 @@ Command = require 'command-interpreter/command'
 module.exports =
 class Address extends Command
   execute: (editor) ->
-    editor.getSelection().setBufferRange(@getRange(editor))
+    range = @getRange(editor)
+    editor.clearSelections()
+    editor.setSelectionBufferRange(range)
 
   isAddress: -> true

src/atom/command-interpreter/command.coffee

@@ -3,3 +3,6 @@ _ = require 'underscore'
 module.exports =
 class Command
   isAddress: -> false
+
+  regexForPattern: (pattern) ->
+    new RegExp(pattern, 'm')

src/atom/command-interpreter/regex-address.coffee

@@ -6,7 +6,7 @@ class RegexAddress extends Address
   regex: null
 
   constructor: (pattern) ->
-    @regex = new RegExp(pattern)
+    @regex = @regexForPattern(pattern)
 
   getRange: (editor) ->
     selectedRange = editor.getSelection().getBufferRange()

src/atom/command-interpreter/select-all-matches.coffee

@@ -6,7 +6,7 @@ class SelectAllMatches extends Command
   @regex: null
 
   constructor: (pattern) ->
-    @regex = new RegExp(pattern)
+    @regex = @regexForPattern(pattern)
 
   execute: (editor) ->
     rangesToSelect = []

src/atom/command-interpreter/substitution.coffee

@@ -5,7 +5,7 @@ class Substitution extends Command
   global: false
 
   constructor: (@findText, @replaceText, @options) ->
-    @findRegex = new RegExp(@findText)
+    @findRegex = @regexForPattern(@findText)
     @global = 'g' in @options
 
   execute: (editor) ->
@@ -27,7 +27,10 @@ class Substitution extends Command
     buffer.change([startPosition, endPosition], @replaceText)
 
     if @global
-      text = text[(match.index + match[0].length)..]
-      startIndex = matchStartIndex + @replaceText.length
+      offset = if match[0].length then 0 else 1
+      startNextStringFragmentAt = match.index + match[0].length + offset
+      return if startNextStringFragmentAt >= text.length
+      text = text[startNextStringFragmentAt..]
+      startIndex = matchStartIndex + offset + @replaceText.length
       @replace(editor, text, startIndex)