--- a/tests/test-diffdir
+++ b/tests/test-diffdir
@@ -7,6 +7,8 @@ hg ci -m "a" -d "0 0"
 
 echo 123 > b
 hg add b
-hg diff | sed "s/\(\(---\|+++\) [a-zA-Z0-9_/.-]*\).*/\1/"
+hg diff | sed -e "s/\(+++ [a-zA-Z0-9_/.-]*\).*/\1/" \
+              -e "s/\(--- [a-zA-Z0-9_/.-]*\).*/\1/"
 
-hg diff -r tip | sed "s/\(\(---\|+++\) [a-zA-Z0-9_/.-]*\).*/\1/"
+hg diff -r tip | sed -e "s/\(+++ [a-zA-Z0-9_/.-]*\).*/\1/" \
+                     -e "s/\(--- [a-zA-Z0-9_/.-]*\).*/\1/"

--- a/tests/test-merge-revert2
+++ b/tests/test-merge-revert2
@@ -27,7 +27,8 @@ hg id
 hg update -C 0
 echo "changed file1 different" >> file1
 HGMERGE=merge hg update
-hg diff | sed -e "s/\(\(---\|+++\) [a-zA-Z0-9_/.-]*\).*/\1/" -e "s/\(<<<<<<<\|>>>>>>>\) .*/\1/"
+hg diff | sed -e "s/\(+++ [a-zA-Z0-9_/.-]*\).*/\1/" -e "s/\(<<<<<<<\) .*/\1/" \
+              -e "s/\(--- [a-zA-Z0-9_/.-]*\).*/\1/" -e "s/\(>>>>>>>\) .*/\1/"
 hg status
 hg id
 hg revert

--- a/tests/test-up-local-change
+++ b/tests/test-up-local-change
@@ -12,8 +12,8 @@ hg clone . ../r2
 cd ../r2
 hg up
 echo abc > a
-hg diff > ../d
-sed "s/\(\(---\|+++\) [a-zA-Z0-9_/.-]*\).*/\1/" < ../d
+hg diff | sed -e "s/\(+++ [a-zA-Z0-9_/.-]*\).*/\1/" \
+              -e "s/\(--- [a-zA-Z0-9_/.-]*\).*/\1/"
 
 cd ../r1
 echo b > b
@@ -28,6 +28,6 @@ hg --debug up
 hg --debug up -m
 hg parents
 hg -v history
-hg diff > ../d
-sed "s/\(\(---\|+++\) [a-zA-Z0-9_/.-]*\).*/\1/" < ../d
+hg diff | sed -e "s/\(+++ [a-zA-Z0-9_/.-]*\).*/\1/" \
+              -e "s/\(--- [a-zA-Z0-9_/.-]*\).*/\1/"