How to Check if String contains only Alphabets and Numbers in C# - Step by Step Examples

How to Check if String contains only Alphabets and Numbers in C# ?

Answer

To check if a string contains only alphabets and numbers in C#, you can use regular expressions from the System.Text.RegularExpressions namespace.

✐ Examples

1 Check if String contains only Alphabets and Numbers using regular expression

In this example,

We import the System.Text.RegularExpressions namespace to use regular expressions.
We create a regular expression pattern that matches alphabets and numbers only.
We use the Regex.IsMatch method of the regular expression to check if the string matches the pattern.
If the string contains only alphabets and numbers, containsOnlyAlphabetsAndNumbers will be true, otherwise false.
Finally, we print the result.

C# Program

using System;
using System.Text.RegularExpressions;

public class Program
{
    public static void Main()
    {
        string str = "Hello123";
        string pattern = "^[a-zA-Z0-9]+$";
        bool containsOnlyAlphabetsAndNumbers = Regex.IsMatch(str, pattern);
        Console.WriteLine("String contains only alphabets and numbers: " + containsOnlyAlphabetsAndNumbers);
    }
}

Output

String contains only alphabets and numbers: True

Summary

In this tutorial, we learned How to Check if String contains only Alphabets and Numbers in C# language with well detailed examples.

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