uCalc API Version: 2.1.3-preview.2 Released: 6/17/2026

Warning

uCalc API Preview Release Notice:The documentation describes the intended behavior of the API. The current preview build contains incomplete features, unoptimized performance, and is subject to breaking changes.

DefaultRuleSet = [Rule]

Property

Product: 

Transformer Library

Class: 

Transformer

Gets a special Rule object that acts as a template, defining the default properties for all new rules created in this Transformer.

Remarks

⚙️ The Default Rule Set: A Template for Consistency

The DefaultRuleSet property provides access to a special Rule object that is not used for matching text itself. Instead, it acts as a prototype or template for all new rules created within its parent Transformer. This is a powerful feature for establishing consistent behavior and reducing boilerplate code.

How It Works

When you create a new rule using FromTo() or Pattern(), the new Rule object starts with a copy of all the property settings from DefaultRuleSet. You can then override these defaults on a per-rule basis.

// Set a default for all rules in this transformert.DefaultRuleSet.CaseSensitive = true;// This rule will now be case-sensitive by defaultvar rule1 = t.FromTo("HELLO", "HI");// You can still override it for a specific rulevar rule2 = t.FromTo("world", "there").SetCaseSensitive(false);

Commonly Configured Properties

This is the ideal place to configure behavior that should apply to most or all rules in a transformer:

💡 Why uCalc? (Comparative Analysis)

Most regular expression engines handle global settings with flags that apply to the entire regex object (e.g., RegexOptions.IgnoreCase in .NET, or the /i flag in Perl/JavaScript). This is often an all-or-nothing choice. If you need two patterns with different case sensitivity, you typically need to create two separate regex objects.

uCalc's model is more object-oriented and flexible. The DefaultRuleSet provides instance-level defaults for a specific Transformer object. This offers superior encapsulation, allowing you to have multiple Transformer instances with different default behaviors running concurrently. Furthermore, the ability to override these defaults on a per-rule basis provides a powerful, two-tiered configuration system that is not available with simple global regex flags.

Examples

WhitespaceSensitive()
				
					using uCalcSoftware;

var uc = new uCalc();
var t = uc.NewTransformer();
var Text = "This is a test.";
var p = t.FromTo("This {words:3}", "[{words}]");

Console.WriteLine($"Input: {Text}");
Console.WriteLine($"Pattern: {p.Pattern}");
Console.WriteLine("");

Console.WriteLine("3 captured tokens are in brackets");
Console.WriteLine("");

Console.WriteLine($"WhitespaceSensitive = {t.DefaultRuleSet.WhitespaceSensitive}");
Console.WriteLine(t.Transform(Text));
Console.WriteLine("");

t.DefaultRuleSet.WhitespaceSensitive = true;
Console.WriteLine($"WhitespaceSensitive = {t.DefaultRuleSet.WhitespaceSensitive}");
Console.WriteLine(t.Transform(Text));

				
			
Input: This is a test.
Pattern: This {words:3}

3 captured tokens are in brackets

WhitespaceSensitive = False
[is a test].

WhitespaceSensitive = True
[ is ]a test.
				
					#include <iostream>
#include "uCalc.h"

using namespace std;
using namespace uCalcSoftware;

#define tf(IsTrue) ((IsTrue) ? "True" : "False")

int main() {
   uCalc uc;
   auto t = uc.NewTransformer();
   auto Text = "This is a test.";
   auto p = t.FromTo("This {words:3}", "[{words}]");

   cout << "Input: " << Text << endl;
   cout << "Pattern: " << p.Pattern() << endl;
   cout << "" << endl;

   cout << "3 captured tokens are in brackets" << endl;
   cout << "" << endl;

   cout << "WhitespaceSensitive = " << tf(t.DefaultRuleSet().WhitespaceSensitive()) << endl;
   cout << t.Transform(Text) << endl;
   cout << "" << endl;

   t.DefaultRuleSet().WhitespaceSensitive(true);
   cout << "WhitespaceSensitive = " << tf(t.DefaultRuleSet().WhitespaceSensitive()) << endl;
   cout << t.Transform(Text) << endl;

}
				
			
Input: This is a test.
Pattern: This {words:3}

3 captured tokens are in brackets

WhitespaceSensitive = False
[is a test].

WhitespaceSensitive = True
[ is ]a test.
				
					Imports System
Imports uCalcSoftware
Public Module Program
   Public Sub Main()
      Dim uc As New uCalc()
      Dim t = uc.NewTransformer()
      Dim Text = "This is a test."
      Dim p = t.FromTo("This {words:3}", "[{words}]")
      
      Console.WriteLine($"Input: {Text}")
      Console.WriteLine($"Pattern: {p.Pattern}")
      Console.WriteLine("")
      
      Console.WriteLine("3 captured tokens are in brackets")
      Console.WriteLine("")
      
      Console.WriteLine($"WhitespaceSensitive = {t.DefaultRuleSet.WhitespaceSensitive}")
      Console.WriteLine(t.Transform(Text))
      Console.WriteLine("")
      
      t.DefaultRuleSet.WhitespaceSensitive = true
      Console.WriteLine($"WhitespaceSensitive = {t.DefaultRuleSet.WhitespaceSensitive}")
      Console.WriteLine(t.Transform(Text))
      
   End Sub
End Module
				
			
Input: This is a test.
Pattern: This {words:3}

3 captured tokens are in brackets

WhitespaceSensitive = False
[is a test].

WhitespaceSensitive = True
[ is ]a test.
StatementSensitive()
				
					using uCalcSoftware;

var uc = new uCalc();
var t = uc.NewTransformer();
t.Text = "x = 1; if (true) func1(3+4); else func2(x*y); y = x + 2";
var p = t.Pattern("if {etc}");

Console.WriteLine($"Input: {t.Text}");
Console.WriteLine($"Pattern: {p.Pattern}");
Console.WriteLine("");

t.Find();
Console.WriteLine($"StatementSensitive: {t.DefaultRuleSet.StatementSensitive}");
Console.WriteLine(t.Matches.Text);
Console.WriteLine("");

t.DefaultRuleSet.StatementSensitive = false;
t.Find();
Console.WriteLine($"StatementSensitive: {t.DefaultRuleSet.StatementSensitive}");
Console.WriteLine(t.Matches.Text);
				
			
Input: x = 1; if (true) func1(3+4); else func2(x*y); y = x + 2
Pattern: if {etc}

StatementSensitive: True
if (true) func1(3+4)

StatementSensitive: False
if (true) func1(3+4); else func2(x*y); y = x + 2
				
					#include <iostream>
#include "uCalc.h"

using namespace std;
using namespace uCalcSoftware;

#define tf(IsTrue) ((IsTrue) ? "True" : "False")

int main() {
   uCalc uc;
   auto t = uc.NewTransformer();
   t.Text("x = 1; if (true) func1(3+4); else func2(x*y); y = x + 2");
   auto p = t.Pattern("if {etc}");

   cout << "Input: " << t.Text() << endl;
   cout << "Pattern: " << p.Pattern() << endl;
   cout << "" << endl;

   t.Find();
   cout << "StatementSensitive: " << tf(t.DefaultRuleSet().StatementSensitive()) << endl;
   cout << t.Matches().Text() << endl;
   cout << "" << endl;

   t.DefaultRuleSet().StatementSensitive(false);
   t.Find();
   cout << "StatementSensitive: " << tf(t.DefaultRuleSet().StatementSensitive()) << endl;
   cout << t.Matches().Text() << endl;
}
				
			
Input: x = 1; if (true) func1(3+4); else func2(x*y); y = x + 2
Pattern: if {etc}

StatementSensitive: True
if (true) func1(3+4)

StatementSensitive: False
if (true) func1(3+4); else func2(x*y); y = x + 2
				
					Imports System
Imports uCalcSoftware
Public Module Program
   Public Sub Main()
      Dim uc As New uCalc()
      Dim t = uc.NewTransformer()
      t.Text = "x = 1; if (true) func1(3+4); else func2(x*y); y = x + 2"
      Dim p = t.Pattern("if {etc}")
      
      Console.WriteLine($"Input: {t.Text}")
      Console.WriteLine($"Pattern: {p.Pattern}")
      Console.WriteLine("")
      
      t.Find()
      Console.WriteLine($"StatementSensitive: {t.DefaultRuleSet.StatementSensitive}")
      Console.WriteLine(t.Matches.Text)
      Console.WriteLine("")
      
      t.DefaultRuleSet.StatementSensitive = false
      t.Find()
      Console.WriteLine($"StatementSensitive: {t.DefaultRuleSet.StatementSensitive}")
      Console.WriteLine(t.Matches.Text)
   End Sub
End Module
				
			
Input: x = 1; if (true) func1(3+4); else func2(x*y); y = x + 2
Pattern: if {etc}

StatementSensitive: True
if (true) func1(3+4)

StatementSensitive: False
if (true) func1(3+4); else func2(x*y); y = x + 2
RewindOnChange
				
					using uCalcSoftware;

var uc = new uCalc();
var ExprT = uc.ExpressionTransformer;  // Transformer used for Eval() and Evaluate()

ExprT.DefaultRuleSet.RewindOnChange = true;

ExprT.FromTo("AddUp({x})", "{x}");
ExprT.FromTo("AddUp({x}, {y})", "({x} + AddUp({y}))");

ExprT.FromTo("ArgCount({x})", "1");
ExprT.FromTo("ArgCount({x}, {y})", "(1 + ArgCount({y}))");

ExprT.FromTo("Average({x}, {y})", "AddUp({x}, {y}) / ArgCount({x}, {y})");

var Expression = "Average(1, 2, 3, 4)";
Console.WriteLine($"Input: {Expression}");
Console.WriteLine($"Transform: {ExprT.Transform(Expression)}");
Console.WriteLine($"Eval: {uc.Eval(Expression)}");
				
			
Input: Average(1, 2, 3, 4)
Transform: (1 + (2 + (3 + 4))) / (1 + (1 + (1 + 1)))
Eval: 2.5
				
					#include <iostream>
#include "uCalc.h"

using namespace std;
using namespace uCalcSoftware;

int main() {
   uCalc uc;
   auto ExprT = uc.ExpressionTransformer();  // Transformer used for Eval() and Evaluate()

   ExprT.DefaultRuleSet().RewindOnChange(true);

   ExprT.FromTo("AddUp({x})", "{x}");
   ExprT.FromTo("AddUp({x}, {y})", "({x} + AddUp({y}))");

   ExprT.FromTo("ArgCount({x})", "1");
   ExprT.FromTo("ArgCount({x}, {y})", "(1 + ArgCount({y}))");

   ExprT.FromTo("Average({x}, {y})", "AddUp({x}, {y}) / ArgCount({x}, {y})");

   auto Expression = "Average(1, 2, 3, 4)";
   cout << "Input: " << Expression << endl;
   cout << "Transform: " << ExprT.Transform(Expression) << endl;
   cout << "Eval: " << uc.Eval(Expression) << endl;
}
				
			
Input: Average(1, 2, 3, 4)
Transform: (1 + (2 + (3 + 4))) / (1 + (1 + (1 + 1)))
Eval: 2.5
				
					Imports System
Imports uCalcSoftware
Public Module Program
   Public Sub Main()
      Dim uc As New uCalc()
      Dim ExprT = uc.ExpressionTransformer  '// Transformer used for Eval() and Evaluate()
      
      ExprT.DefaultRuleSet.RewindOnChange = true
      
      ExprT.FromTo("AddUp({x})", "{x}")
      ExprT.FromTo("AddUp({x}, {y})", "({x} + AddUp({y}))")
      
      ExprT.FromTo("ArgCount({x})", "1")
      ExprT.FromTo("ArgCount({x}, {y})", "(1 + ArgCount({y}))")
      
      ExprT.FromTo("Average({x}, {y})", "AddUp({x}, {y}) / ArgCount({x}, {y})")
      
      Dim Expression = "Average(1, 2, 3, 4)"
      Console.WriteLine($"Input: {Expression}")
      Console.WriteLine($"Transform: {ExprT.Transform(Expression)}")
      Console.WriteLine($"Eval: {uc.Eval(Expression)}")
   End Sub
End Module
				
			
Input: Average(1, 2, 3, 4)
Transform: (1 + (2 + (3 + 4))) / (1 + (1 + (1 + 1)))
Eval: 2.5
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