Rename regexp to reflect review feedback on semicolon change.

lib/compiler/implementation/js/printer.dart

Index: lib/compiler/implementation/js/printer.dart
diff --git a/lib/compiler/implementation/js/printer.dart b/lib/compiler/implementation/js/printer.dart
index 6f550254382e4a1fa31156805ea77b4d03c0ee47..87a4ffd89edc041a1b1ffca632b9288ed9295668 100644
--- a/lib/compiler/implementation/js/printer.dart
+++ b/lib/compiler/implementation/js/printer.dart
@@ -44,12 +44,12 @@ class Printer implements NodeVisitor {
 
   void out(String str) {
     if (str != "") {
-      const identifierRegexp = const RegExp(r'^[a-zA-Z_0-9$]');
+      const identifierCharacterRegExp = const RegExp(r'^[a-zA-Z_0-9$]');
       if (pendingSemicolon && (!shouldCompressOutput || str != "}")) {
         outBuffer.add(";");
       }
       if (pendingSpace &&
-          (!shouldCompressOutput || identifierRegexp.hasMatch(str))) {
+          (!shouldCompressOutput || identifierCharacterRegExp.hasMatch(str))) {
         outBuffer.add(" ");
       }
       pendingSpace = false;