Use a raw string as argument to re.compile()

* tools/server-side/svn-backup-dumps.py
  (get_last_dumped_rev): As above

Patch by: koumotoyouichi@gmail.com

dev@:  https://lists.apache.org/thread/owpvst9pw7sg5rq79snnxxkpcxn0w6k2


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1931849 13f79535-47bb-0310-9956-ffa450edef68

Author: d-sahlberg

tools/server-side/svn-backup-dumps.py

@@ -149,7 +149,7 @@
 #  - improve documentation
 #
 
-__version = "0.6"
+__version = "0.7"
 
 import sys
 import os
@@ -452,7 +452,7 @@ def get_head_rev(self):
         return -1
 
     def get_last_dumped_rev(self):
-        filename_regex = re.compile("(.+)\.\d+-(\d+)\.svndmp.*")
+        filename_regex = re.compile(r"(.+)\.\d+-(\d+)\.svndmp.*")
         # start with -1 so the next one will be rev 0
         highest_rev = -1