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-rw-r--r--build2/regex.cxx42
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diff --git a/build2/regex.cxx b/build2/regex.cxx
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+// file : build2/regex.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
+// license : MIT; see accompanying LICENSE file
+
+#include <build2/regex>
+
+#if defined(_MSC_VER) && _MSC_VER <= 1910
+# include <cstring> // strstr()
+#endif
+
+#include <ostream>
+#include <sstream>
+
+namespace std
+{
+ // Currently libstdc++ just returns the name of the exception (bug #67361).
+ // So we check that the description contains at least one space character.
+ //
+ // While VC's description is meaningful, it has an undesired prefix that
+ // resembles the following: 'regex_error(error_badrepeat): '. So we skip it.
+ //
+ ostream&
+ operator<< (ostream& o, const regex_error& e)
+ {
+ const char* d (e.what ());
+
+#if defined(_MSC_VER) && _MSC_VER <= 1910
+ const char* rd (strstr (d, "): "));
+ if (rd != nullptr)
+ d = rd + 3;
+#endif
+
+ ostringstream os;
+ os << runtime_error (d); // Sanitize the description.
+
+ string s (os.str ());
+ if (s.find (' ') != string::npos)
+ o << ": " << s;
+
+ return o;
+ }
+}