--- a/hgext/convert/common.py	Thu Apr 25 16:02:58 2013 -0700
+++ b/hgext/convert/common.py	Thu Apr 25 18:01:00 2013 -0700
@@ -67,8 +67,7 @@
         """ fails if revstr is not a 40 byte hex. mercurial and git both uses
             such format for their revision numbering
         """
-        matchobj = re.match(r'[0-9a-fA-F]{40,40}$', revstr)
-        if matchobj is None:
+        if not re.match(r'[0-9a-fA-F]{40,40}$', revstr):
             raise util.Abort(_('splicemap entry %s is not a valid revision'
                                ' identifier') % revstr)
 

--- a/hgext/convert/subversion.py	Thu Apr 25 16:02:58 2013 -0700
+++ b/hgext/convert/subversion.py	Thu Apr 25 18:01:00 2013 -0700
@@ -452,6 +452,14 @@
         del self.commits[rev]
         return commit
 
+    def checkrevformat(self, revstr):
+        """ fails if revision format does not match the correct format"""
+        if not re.match(r'svn:[0-9a-f]{8,8}-[0-9a-f]{4,4}-'
+                              '[0-9a-f]{4,4}-[0-9a-f]{4,4}-[0-9a-f]'
+                              '{12,12}(.*)\@[0-9]+$',revstr):
+            raise util.Abort(_('splicemap entry %s is not a valid revision'
+                               ' identifier') % revstr)
+
     def gettags(self):
         tags = {}
         if self.tags is None:

--- a/tests/test-convert-svn-source.t	Thu Apr 25 16:02:58 2013 -0700
+++ b/tests/test-convert-svn-source.t	Thu Apr 25 18:01:00 2013 -0700
@@ -16,6 +16,8 @@
 #else
   $ SVNREPOURL=file://`python -c "import urllib, sys; sys.stdout.write(urllib.quote(sys.argv[1]))" "$SVNREPOPATH"`
 #endif
+  $ INVALIDREVISIONID=svn:x2147622-4a9f-4db4-a8d3-13562ff547b2/proj%20B/mytrunk@1
+  $ VALIDREVISIONID=svn:a2147622-4a9f-4db4-a8d3-13562ff547b2/proj%20B/mytrunk/mytrunk@1
 
 Now test that it works with trunk/tags layout, but no branches yet.
 
@@ -168,6 +170,15 @@
   |
   o  0 second letter files: letter2.txt
   
+test invalid splicemap1
+
+  $ cat > splicemap <<EOF
+  > $INVALIDREVISIONID $VALIDREVISIONID
+  > EOF
+  $ hg convert --splicemap splicemap "$SVNREPOURL/proj%20B/mytrunk" smap
+  initializing destination smap repository
+  abort: splicemap entry svn:x2147622-4a9f-4db4-a8d3-13562ff547b2/proj%20B/mytrunk@1 is not a valid revision identifier
+  [255]
 
 Test stop revision
   $ hg convert --rev 1 "$SVNREPOURL/proj%20B/mytrunk" stoprev