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-rw-r--r--src/libutil/url-parts.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libutil/url-parts.hh b/src/libutil/url-parts.hh
index 64e06cfbc..68be15cb0 100644
--- a/src/libutil/url-parts.hh
+++ b/src/libutil/url-parts.hh
@@ -7,7 +7,7 @@ namespace nix {
// URI stuff.
const static std::string pctEncoded = "(?:%[0-9a-fA-F][0-9a-fA-F])";
-const static std::string schemeRegex = "(?:[a-z+.-]+)";
+const static std::string schemeRegex = "(?:[a-z][a-z0-9+.-]*)";
const static std::string ipv6AddressRegex = "(?:\\[[0-9a-fA-F:]+\\])";
const static std::string unreservedRegex = "(?:[a-zA-Z0-9-._~])";
const static std::string subdelimsRegex = "(?:[!$&'\"()*+,;=])";