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+++ b/README.md
@@ -36,7 +36,7 @@ Limitations
Only alphanumeric variable names are supported.
Speaking more precisely, directory names must match the
-`^%[_[:alpha:]][_[:alnum:]]+%$` regular expression.
+`^%[_[:alpha:]][_[:alnum:]]*%$` regular expression.
This means that, for example, the environment variable `ProgramFiles(x86)` is
not supported.