fix(angular.copy): change angular.copy to correcly clone RegExp

angular.copy previously copied RegExp as an empty object. Change detects
RegExp instance and clones into new RegExp. This change is based on a previous
fix to allow Date to be copied.

Closes #3473
Closes #3474

1 files changed, 2 insertions, 0 deletions

diff --git a/src/Angular.js b/src/Angular.js
index 0a38b230..8fd77096 100644
--- a/src/Angular.js
+++ b/src/Angular.js
@@ -587,6 +587,8 @@ function copy(source, destination){
         destination = copy(source, []);
       } else if (isDate(source)) {
         destination = new Date(source.getTime());
+      } else if (isRegExp(source)) {
+        destination = new RegExp(source.source);
       } else if (isObject(source)) {
         destination = copy(source, {});
       }