detect-conversations: correct all-groups regexp.

diff --git a/scripts/detect-conversations b/scripts/detect-conversations
index 9163aad..58c793f 100755 (executable)
--- a/scripts/detect-conversations
+++ b/scripts/detect-conversations
@@ -40,7 +40,7 @@ die "ERROR: excess arguments\n" if @ARGV > 0;
 
 # Compute group pattern
 my $re;
-if(@hierarchies == 0) { $re = ""; }
+if(@hierarchies == 0) { $re = "^\\S+"; }
 else                  { $re = "^(" . join("|", @hierarchies) . ")\\.\\S+"; }
 
 # Get group list