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-rw-r--r--src/nix/develop.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/nix/develop.cc b/src/nix/develop.cc
index 6c089469d..699ec0b99 100644
--- a/src/nix/develop.cc
+++ b/src/nix/develop.cc
@@ -54,7 +54,7 @@ BuildEnvironment readEnvironment(const Path & path)
R"re((?:[a-zA-Z_][a-zA-Z0-9_]*))re";
static std::string simpleStringRegex =
- R"re((?:[a-zA-Z0-9_/:\.\-\+=]*))re";
+ R"re((?:[a-zA-Z0-9_/:\.\-\+=@%]*))re";
static std::string dquotedStringRegex =
R"re((?:\$?"(?:[^"\\]|\\[$`"\\\n])*"))re";