Add r prefix to regular expression strings.

The r prefix makes the string a raw string.

This isn't technically required, and has no real affect, however might
make future changes easier.

Change-Id: I69b767b112acf0fdbb5d3bc0ded47753d118bc29

karaage/conf/defaults.py

@@ -340,7 +340,7 @@
 }
 
 # RE for validing a username.
-USERNAME_VALIDATION_RE = '[-\w]+'
+USERNAME_VALIDATION_RE = r'[-\w]+'
 
 # Error to display if username validation failed.
 USERNAME_VALIDATION_ERROR_MSG = six.u(
@@ -349,7 +349,7 @@
 USERNAME_MAX_LENGTH = 255
 
 # RE for validing a project.
-PROJECT_VALIDATION_RE = '[-\w]+'
+PROJECT_VALIDATION_RE = r'[-\w]+'
 
 # Max length of a project identifier
 PROJECT_ID_MAX_LENGTH = 255
@@ -360,7 +360,7 @@
     'numbers and underscores')
 
 # RE for validing a group id.
-GROUP_VALIDATION_RE = '[-\w]+'
+GROUP_VALIDATION_RE = r'[-\w]+'
 
 # Error to display if group validation failed.
 GROUP_VALIDATION_ERROR_MSG = six.u(