switch to boost::regex and only construct regex once

Signed-off-by: map-per <map-per@gmx.de>

libs/editor/xml_feature.cpp

@@ -16,7 +16,7 @@
 #include "base/timer.hpp"
 
 #include <array>
-#include <regex>
+#include <boost/regex.hpp>
 #include <sstream>
 #include <string>
 
@@ -712,20 +712,21 @@ void XMLFeature::OSMBusinessReplacement(uint32_t old_type, uint32_t new_type)
   std::string name = GetTagValue("name");
 
   // Remove OSM tags using the list from keys_to_remove.hpp
-  std::string regexPattern;
+  static const boost::regex regex([] {
+    std::string regexPattern;
 
-  for (auto const & key : kKeysToRemove)
+    for (auto const & key : kKeysToRemove)
+    {
+      if (!regexPattern.empty())
+        regexPattern.append("|");
+      regexPattern.append(key);
+    }
+    return regexPattern;
+  }());
+
+  ForEachTag([this](std::string_view key, std::string_view /*value*/)
   {
-    if (!regexPattern.empty())
-      regexPattern.append("|");
-    regexPattern.append(key);
-  }
-
-  std::regex regex(regexPattern);
-
-  ForEachTag([& regex, this](std::string_view key, std::string_view /*value*/)
-  {
-    if (std::regex_match(key.begin(), key.end(), regex))
+    if (boost::regex_match(key.begin(), key.end(), regex))
       RemoveTag(key);
   });