diff --git a/crpptbx/TCV/gdat_tcv.m b/crpptbx/TCV/gdat_tcv.m
index 63fb9ad663d33d2adee89c859040dcd40f75fb49..892b34798f41e9892d58c59b9a409b867ccaedda 100644
--- a/crpptbx/TCV/gdat_tcv.m
+++ b/crpptbx/TCV/gdat_tcv.m
@@ -375,7 +375,7 @@ if strcmp(mapping_for_tcv.method(1:3),'tdi')
         if ~isempty(ij)
           mapping_for_tcv.expression(ij+5:ij+6) = substr_liuqe;
         end
-        ij = regexpi(mapping_for_tcv.expression,'LIUQE.*\.M','once');
+        ij = regexpi(mapping_for_tcv.expression,'LIUQE\.M.?','once');
         if ~isempty(ij)
           ichar_after_liuqe = 7;
           if strcmp(mapping_for_tcv.expression(ij+ichar_after_liuqe),'2') || ...
@@ -416,7 +416,7 @@ if strcmp(mapping_for_tcv.method(1:3),'tdi')
           end
         end
       else
-        ij = regexpi(mapping_for_tcv.expression,'LIUQE.*\.M','once');
+        ij = regexpi(mapping_for_tcv.expression,'LIUQE\.M.?','once');
         if ~isempty(ij)
           mapping_for_tcv.expression = [mapping_for_tcv.expression(1:ij+4) substr_liuqe_tcv_eq mapping_for_tcv.expression(ij+7:end)];
           do_liuqem2liuqef = 1;