From c3c7aedbb5ac869b7c454e90683f77b9c527a75a Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Fri, 3 Jul 2020 14:58:58 +0200
Subject: [PATCH] nix develop: Fix bad regex

This was accepted by libstdc++ but not libc++.

https://hydra.nixos.org/build/123569154
---
 src/nix/develop.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/nix/develop.cc b/src/nix/develop.cc
index 289e3bed3..eb93f56fc 100644
--- a/src/nix/develop.cc
+++ b/src/nix/develop.cc
@@ -50,7 +50,7 @@ BuildEnvironment readEnvironment(const Path & path)
         R"re((?:\$?'(?:[^'\\]|\\[abeEfnrtv\\'"?])*'))re";
 
     static std::string indexedArrayRegex =
-        R"re((?:\(( *\[[0-9]+]="(?:[^"\\]|\\.)*")**\)))re";
+        R"re((?:\(( *\[[0-9]+\]="(?:[^"\\]|\\.)*")*\)))re";
 
     static std::regex varRegex(
         "^(" + varNameRegex + ")=(" + simpleStringRegex + "|" + quotedStringRegex + "|" + indexedArrayRegex + ")\n");