Make :/ accept a regex rather than a fixed pattern

diff --git a/t/t0021-conversion.sh b/t/t0021-conversion.sh
index cb860296edfab2d117fc8b62505df00a51baed02..6cb8d60ea2649495c0e3c8bbb8b7cc75c36799b7 100755 (executable)
--- a/t/t0021-conversion.sh
+++ b/t/t0021-conversion.sh
@@ -4,8 +4,11 @@ test_description='blob conversion via gitattributes'
 
 . ./test-lib.sh
 
-cat <<\EOF >rot13.sh
-tr '[a-zA-Z]' '[n-za-mN-ZA-M]'
+cat <<EOF >rot13.sh
+#!$SHELL_PATH
+tr \
+  'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' \
+  'nopqrstuvwxyzabcdefghijklmNOPQRSTUVWXYZABCDEFGHIJKLM'
 EOF
 chmod +x rot13.sh