diff --git a/src/ripple/net/impl/RPCCall.cpp b/src/ripple/net/impl/RPCCall.cpp
index df758646540..1242fdc2a68 100644
--- a/src/ripple/net/impl/RPCCall.cpp
+++ b/src/ripple/net/impl/RPCCall.cpp
@@ -121,7 +121,13 @@ class RPCParser
     static Json::Value
     jvParseCurrencyIssuer(std::string const& strCurrencyIssuer)
     {
-        static boost::regex reCurIss("\\`([[:alpha:]]{3})(?:/(.+))?\\'");
+        // Matches a sequence of 3 characters from
+        // `ripple::detail::isoCharSet` (the currency),
+        // optionally followed by a forward slash and some other characters
+        // (the issuer).
+        // https://www.boost.org/doc/libs/1_82_0/libs/regex/doc/html/boost_regex/syntax/perl_syntax.html
+        static boost::regex reCurIss(
+            "\\`([][:alnum:]<>(){}[|?!@#$%^&*]{3})(?:/(.+))?\\'");
 
         boost::smatch smMatch;
 
diff --git a/src/ripple/protocol/impl/UintTypes.cpp b/src/ripple/protocol/impl/UintTypes.cpp
index ff2644b085b..821e81238b0 100644
--- a/src/ripple/protocol/impl/UintTypes.cpp
+++ b/src/ripple/protocol/impl/UintTypes.cpp
@@ -93,14 +93,8 @@ to_currency(Currency& currency, std::string const& code)
 
         currency = beast::zero;
 
-        std::transform(
-            code.begin(),
-            code.end(),
-            currency.begin() + detail::isoCodeOffset,
-            [](auto c) {
-                return static_cast<unsigned char>(
-                    ::toupper(static_cast<unsigned char>(c)));
-            });
+        std::copy(
+            code.begin(), code.end(), currency.begin() + detail::isoCodeOffset);
 
         return true;
     }