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.

EndPosition = [int]

Property

Product: 

Transformer Library

Class: 

Match

Gets the zero-based index of the character position immediately following the match's last character.

Remarks

🎯 Finding Where a Match Concludes

The EndPosition property returns the zero-based character index immediately after the last character of a specific match. It represents the exclusive end boundary of the matched text segment.

This property is fundamental for understanding the location and span of a match. It is almost always used in conjunction with the StartPosition property to determine the exact range of a match in the source text.

The End = Start + Length Rule

The relationship between the three positional properties is simple and consistent:

match.Length() = match.EndPosition() - match.StartPosition()

This means EndPosition points to where the next search would begin after this match is processed, making it crucial for manual parsing logic or when building tools that need to slice the original string.

💡 Comparative Analysis

  • vs. .NET Regex Match.Index + Match.Length: In .NET's System.Text.RegularExpressions, you typically calculate the end position manually by adding the Length to the starting Index. uCalc provides a dedicated EndPosition property for convenience, reducing boilerplate code and making the intent clearer.

  • vs. String Substring/Slicing Functions: Many language's substring functions require a start index and a length. EndPosition provides the information needed to calculate this length, but also serves as the direct end index for languages that support range-based slicing (like Python's text[start:end]).

Examples

Returns Start and End positions of Transformer matches
				
					using uCalcSoftware;

var uc = new uCalc();
var t = uc.NewTransformer();
t.Text = "<br><h1>First</h1>Blah Blah<br>Testing<br><h2>Second</h2>";
//         ^             ^                       ^              ^
//     012345678901234567890123456789012345678901234567890123456789
//     0         10        20        30        40        50
// Carrets (^) point to Start and End locations of the matches

Console.WriteLine(t.Text);
Console.WriteLine("");

t.Pattern("<{tag}>{etc}</{tag}>");
t.Find();
var Matches = t.Matches;

Console.WriteLine(Matches[0].Text);
Console.WriteLine($"Start pos: {Matches[0].StartPosition}");
Console.WriteLine($"End pos: {Matches[0].EndPosition}");
Console.WriteLine($"Length: {Matches[0].Length}");
Console.WriteLine("");

Console.WriteLine(Matches[1].Text);
Console.WriteLine($"Start pos: {Matches[1].StartPosition}");
Console.WriteLine($"End pos: {Matches[1].EndPosition}");
Console.WriteLine($"Length: {Matches[1].Length}");
				
			
<br><h1>First</h1>Blah Blah<br>Testing<br><h2>Second</h2>

<h1>First</h1>
Start pos: 4
End pos: 18
Length: 14

<h2>Second</h2>
Start pos: 42
End pos: 57
Length: 15
				
					#include <iostream>
#include "uCalc.h"

using namespace std;
using namespace uCalcSoftware;

int main() {
   uCalc uc;
   auto t = uc.NewTransformer();
   t.Text("<br><h1>First</h1>Blah Blah<br>Testing<br><h2>Second</h2>");
   //         ^             ^                       ^              ^
   //     012345678901234567890123456789012345678901234567890123456789
   //     0         10        20        30        40        50
   // Carrets (^) point to Start and End locations of the matches

   cout << t.Text() << endl;
   cout << "" << endl;

   t.Pattern("<{tag}>{etc}</{tag}>");
   t.Find();
   auto Matches = t.Matches();

   cout << Matches[0].Text() << endl;
   cout << "Start pos: " << Matches[0].StartPosition() << endl;
   cout << "End pos: " << Matches[0].EndPosition() << endl;
   cout << "Length: " << Matches[0].Length() << endl;
   cout << "" << endl;

   cout << Matches[1].Text() << endl;
   cout << "Start pos: " << Matches[1].StartPosition() << endl;
   cout << "End pos: " << Matches[1].EndPosition() << endl;
   cout << "Length: " << Matches[1].Length() << endl;
}
				
			
<br><h1>First</h1>Blah Blah<br>Testing<br><h2>Second</h2>

<h1>First</h1>
Start pos: 4
End pos: 18
Length: 14

<h2>Second</h2>
Start pos: 42
End pos: 57
Length: 15
				
					Imports System
Imports uCalcSoftware
Public Module Program
   Public Sub Main()
      Dim uc As New uCalc()
      Dim t = uc.NewTransformer()
      t.Text = "<br><h1>First</h1>Blah Blah<br>Testing<br><h2>Second</h2>"
      '//         ^             ^                       ^              ^
      '//     012345678901234567890123456789012345678901234567890123456789
      '//     0         10        20        30        40        50
      '// Carrets (^) point to Start and End locations of the matches
      
      Console.WriteLine(t.Text)
      Console.WriteLine("")
      
      t.Pattern("<{tag}>{etc}</{tag}>")
      t.Find()
      Dim Matches = t.Matches
      
      Console.WriteLine(Matches(0).Text)
      Console.WriteLine($"Start pos: {Matches(0).StartPosition}")
      Console.WriteLine($"End pos: {Matches(0).EndPosition}")
      Console.WriteLine($"Length: {Matches(0).Length}")
      Console.WriteLine("")
      
      Console.WriteLine(Matches(1).Text)
      Console.WriteLine($"Start pos: {Matches(1).StartPosition}")
      Console.WriteLine($"End pos: {Matches(1).EndPosition}")
      Console.WriteLine($"Length: {Matches(1).Length}")
   End Sub
End Module
				
			
<br><h1>First</h1>Blah Blah<br>Testing<br><h2>Second</h2>

<h1>First</h1>
Start pos: 4
End pos: 18
Length: 14

<h2>Second</h2>
Start pos: 42
End pos: 57
Length: 15
Returns Start and End positions of Transformer matches
				
					using uCalcSoftware;

var uc = new uCalc();
var t = uc.NewTransformer();
t.Text = "<br><h1>First</h1>Blah Blah<br>Testing<br><h2>Second</h2>";
//         ^             ^                       ^              ^
//     012345678901234567890123456789012345678901234567890123456789
//     0         10        20        30        40        50
// Carrets (^) point to Start and End locations of the matches

Console.WriteLine(t.Text);
Console.WriteLine("");

t.Pattern("<{tag}>{etc}</{tag}>");
t.Find();
var Matches = t.Matches;

Console.WriteLine(Matches[0].Text);
Console.WriteLine($"Start pos: {Matches[0].StartPosition}");
Console.WriteLine($"End pos: {Matches[0].EndPosition}");
Console.WriteLine($"Length: {Matches[0].Length}");
Console.WriteLine("");

Console.WriteLine(Matches[1].Text);
Console.WriteLine($"Start pos: {Matches[1].StartPosition}");
Console.WriteLine($"End pos: {Matches[1].EndPosition}");
Console.WriteLine($"Length: {Matches[1].Length}");
				
			
<br><h1>First</h1>Blah Blah<br>Testing<br><h2>Second</h2>

<h1>First</h1>
Start pos: 4
End pos: 18
Length: 14

<h2>Second</h2>
Start pos: 42
End pos: 57
Length: 15
				
					#include <iostream>
#include "uCalc.h"

using namespace std;
using namespace uCalcSoftware;

int main() {
   uCalc uc;
   auto t = uc.NewTransformer();
   t.Text("<br><h1>First</h1>Blah Blah<br>Testing<br><h2>Second</h2>");
   //         ^             ^                       ^              ^
   //     012345678901234567890123456789012345678901234567890123456789
   //     0         10        20        30        40        50
   // Carrets (^) point to Start and End locations of the matches

   cout << t.Text() << endl;
   cout << "" << endl;

   t.Pattern("<{tag}>{etc}</{tag}>");
   t.Find();
   auto Matches = t.Matches();

   cout << Matches[0].Text() << endl;
   cout << "Start pos: " << Matches[0].StartPosition() << endl;
   cout << "End pos: " << Matches[0].EndPosition() << endl;
   cout << "Length: " << Matches[0].Length() << endl;
   cout << "" << endl;

   cout << Matches[1].Text() << endl;
   cout << "Start pos: " << Matches[1].StartPosition() << endl;
   cout << "End pos: " << Matches[1].EndPosition() << endl;
   cout << "Length: " << Matches[1].Length() << endl;
}
				
			
<br><h1>First</h1>Blah Blah<br>Testing<br><h2>Second</h2>

<h1>First</h1>
Start pos: 4
End pos: 18
Length: 14

<h2>Second</h2>
Start pos: 42
End pos: 57
Length: 15
				
					Imports System
Imports uCalcSoftware
Public Module Program
   Public Sub Main()
      Dim uc As New uCalc()
      Dim t = uc.NewTransformer()
      t.Text = "<br><h1>First</h1>Blah Blah<br>Testing<br><h2>Second</h2>"
      '//         ^             ^                       ^              ^
      '//     012345678901234567890123456789012345678901234567890123456789
      '//     0         10        20        30        40        50
      '// Carrets (^) point to Start and End locations of the matches
      
      Console.WriteLine(t.Text)
      Console.WriteLine("")
      
      t.Pattern("<{tag}>{etc}</{tag}>")
      t.Find()
      Dim Matches = t.Matches
      
      Console.WriteLine(Matches(0).Text)
      Console.WriteLine($"Start pos: {Matches(0).StartPosition}")
      Console.WriteLine($"End pos: {Matches(0).EndPosition}")
      Console.WriteLine($"Length: {Matches(0).Length}")
      Console.WriteLine("")
      
      Console.WriteLine(Matches(1).Text)
      Console.WriteLine($"Start pos: {Matches(1).StartPosition}")
      Console.WriteLine($"End pos: {Matches(1).EndPosition}")
      Console.WriteLine($"Length: {Matches(1).Length}")
   End Sub
End Module
				
			
<br><h1>First</h1>Blah Blah<br>Testing<br><h2>Second</h2>

<h1>First</h1>
Start pos: 4
End pos: 18
Length: 14

<h2>Second</h2>
Start pos: 42
End pos: 57
Length: 15
Matches
				
					using uCalcSoftware;

var uc = new uCalc();
var t = uc.NewTransformer();
t.Text = "<h3>Title</h3><b>Bold statement</b><!--<h3>Title B</h3>--><b>Other text</b><p>My paragraph</p>";
//     0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456
//     0         10        20        30        40        50        60        70        80        90
//     ^             ^                                           ^                ^                  ^
// Carrets (^) represent starting and ending point of the matches

t.Pattern("<{tag}>{text}</{tag}>");
t.Pattern("<b>{text}</b>");
t.Pattern("<h3>{text}</h3>");
t.SkipOver("<!--{text}-->");
t.Find();

foreach(var match in t.Matches) {
   Console.WriteLine(match.Text);
   Console.WriteLine($"Start pos: {match.StartPosition}");
   Console.WriteLine($"End pos: {match.EndPosition}");
   Console.WriteLine($"Length: {match.Length}");
   Console.WriteLine("");
}
				
			
<h3>Title</h3>
Start pos: 0
End pos: 14
Length: 14

<b>Bold statement</b>
Start pos: 14
End pos: 35
Length: 21

<b>Other text</b>
Start pos: 58
End pos: 75
Length: 17

<p>My paragraph</p>
Start pos: 75
End pos: 94
Length: 19
				
					#include <iostream>
#include "uCalc.h"

using namespace std;
using namespace uCalcSoftware;

int main() {
   uCalc uc;
   auto t = uc.NewTransformer();
   t.Text("<h3>Title</h3><b>Bold statement</b><!--<h3>Title B</h3>--><b>Other text</b><p>My paragraph</p>");
   //     0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456
   //     0         10        20        30        40        50        60        70        80        90
   //     ^             ^                                           ^                ^                  ^
   // Carrets (^) represent starting and ending point of the matches

   t.Pattern("<{tag}>{text}</{tag}>");
   t.Pattern("<b>{text}</b>");
   t.Pattern("<h3>{text}</h3>");
   t.SkipOver("<!--{text}-->");
   t.Find();

   for(auto match : t.Matches()) {
      cout << match.Text() << endl;
      cout << "Start pos: " << match.StartPosition() << endl;
      cout << "End pos: " << match.EndPosition() << endl;
      cout << "Length: " << match.Length() << endl;
      cout << "" << endl;
   }
}
				
			
<h3>Title</h3>
Start pos: 0
End pos: 14
Length: 14

<b>Bold statement</b>
Start pos: 14
End pos: 35
Length: 21

<b>Other text</b>
Start pos: 58
End pos: 75
Length: 17

<p>My paragraph</p>
Start pos: 75
End pos: 94
Length: 19
				
					Imports System
Imports uCalcSoftware
Public Module Program
   Public Sub Main()
      Dim uc As New uCalc()
      Dim t = uc.NewTransformer()
      t.Text = "<h3>Title</h3><b>Bold statement</b><!--<h3>Title B</h3>--><b>Other text</b><p>My paragraph</p>"
      '//     0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456
      '//     0         10        20        30        40        50        60        70        80        90
      '//     ^             ^                                           ^                ^                  ^
      '// Carrets (^) represent starting and ending point of the matches
      
      t.Pattern("<{tag}>{text}</{tag}>")
      t.Pattern("<b>{text}</b>")
      t.Pattern("<h3>{text}</h3>")
      t.SkipOver("<!--{text}-->")
      t.Find()
      
      For Each match In t.Matches
         Console.WriteLine(match.Text)
         Console.WriteLine($"Start pos: {match.StartPosition}")
         Console.WriteLine($"End pos: {match.EndPosition}")
         Console.WriteLine($"Length: {match.Length}")
         Console.WriteLine("")
      Next
   End Sub
End Module
				
			
<h3>Title</h3>
Start pos: 0
End pos: 14
Length: 14

<b>Bold statement</b>
Start pos: 14
End pos: 35
Length: 21

<b>Other text</b>
Start pos: 58
End pos: 75
Length: 17

<p>My paragraph</p>
Start pos: 75
End pos: 94
Length: 19
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