Create the QRegularExpression in the TextNode constructor instead of for

each row in the filtered table.
On a table of more than 1M entries it speeds up filtering almost tenfold (from 35s to 4s).

apps/opencs/model/filter/textnode.cpp

@@ -13,6 +13,8 @@
 CSMFilter::TextNode::TextNode(int columnId, const std::string& text)
     : mColumnId(columnId)
     , mText(text)
+    , mRegExp(QRegularExpression::anchoredPattern(QString::fromUtf8(mText.c_str())),
+          QRegularExpression::CaseInsensitiveOption)
 {
 }
 
@@ -57,9 +59,7 @@ bool CSMFilter::TextNode::test(const CSMWorld::IdTableBase& table, int row, cons
         return false;
 
     /// \todo make pattern syntax configurable
-    QRegularExpression regExp(QRegularExpression::anchoredPattern(QString::fromUtf8(mText.c_str())),
-        QRegularExpression::CaseInsensitiveOption);
-    QRegularExpressionMatch match = regExp.match(string);
+    QRegularExpressionMatch match = mRegExp.match(string);
 
     return match.hasMatch();
 }

apps/opencs/model/filter/textnode.hpp

@@ -5,6 +5,8 @@
 #include <string>
 #include <vector>
 
+#include <QRegularExpression>
+
 #include <apps/opencs/model/world/idtablebase.hpp>
 
 #include "leafnode.hpp"
@@ -15,6 +17,7 @@ namespace CSMFilter
     {
         int mColumnId;
         std::string mText;
+        QRegularExpression mRegExp;
 
     public:
         TextNode(int columnId, const std::string& text);