Finding the Word in the Given Paragraph in Windows Store app

Introduction

In this article I discuss the Match class of the System.Text.RegularExpression namespace in Windows 8 application. By using this class we can find a particular word, value or letter that matches the given context. By using the Success property of the Match class we can determine whether the word matches or not; true indicates success. Their are various other properties that we can use in the Match class. The Match class represents the results from a single regular expression match. Some of the properties that I use in this application are :

Value : Gets the captured substring from the input string.

Index : The position in the original string where the first character of the captured substring is found.

Length : Gets the length of the captured substring.

Success : Gets a value indicating whether the match is successful.

Now to see how we find the word in the given paragraph, use the following steps :

Step 1

Open Visual Studio 2012 RC and click File -> New -> Project.

Step 2

A New Project dialog appears, in this select window Metro style inside the Visual C# at the left side pane then select Blank Page in the center pane and after giving the name of your application click ok.

Step 3

Now to do the designing by writing the code in the MainPage.xaml file as:

<Page

x:Class="practice1.MainPage"

IsTabStop="false"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:local="using:practice1"

xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

mc:Ignorable="d">

<Grid>

<Grid.Background>

</LinearGradientBrush>

</Grid.Background>

</Grid>

</Page>

Step 4

Now add the namespace in the MainPage.xaml.cs file as:

using System.Text.RegularExpressions;

Step 5

Write the code in the MainPage.xaml.cs file as:

public sealed partial class MainPage : Page

{

public MainPage()

{

this.InitializeComponent();

}

protected override void OnNavigatedTo(NavigationEventArgs e)

{

}

public void Button_Click_1(object sender, RoutedEventArgs e)

{

string pattern = word.Text;

string input = paragraph.Text;

Match match = Regex.Match(input, pattern);

if (match.Success)

// Report position as a one-based integer.

Display.Text = "The word :" + match.Value + "\n was found at position : " + (match.Index + 1) + "\n in \n" + input + "\n The length of the captured word is :" + pattern.Length;

else

Display.Text = "The Word : " + pattern + " \n was not found in : " + input;

}

}

Step 6

Now to Run the application, press F5. The output will look like:

Output-Screen-For-Finding-The-Word-In-Windows-8-Apps.jpg

Now enter the paragraph and the word that we want to search for and click on the find button. Now the details of that word would be displayed, like:

Finding-The-Word-In-Given-Paragraph-In-Windows-8-Apps.jpg

Summary

In this article I explained how to find the data in the given context.