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String replace ignore case in C#

To replace a string and ignoring case in C# we can use regular expression with 4 parameters:

1. First parameter will be the original string.
2. Second parameter will be the string to be replaced.
3. Third parameter will be the new string.
4. Forth parameter will be the property RegexOptions.IgnoreCase

Example

using System;
using System.Text.RegularExpressions;

public class Program
{
	public static void Main()
	{
		string input = "hello WoRlD";
		string res = Regex.Replace(input, "world", "Tom", RegexOptions.IgnoreCase);
		Console.WriteLine(res);
	}
}

Output

hello Tom

Conclusion

In this page (written and validated by ) you learned about String replace ignore case in C# . What's Next? If you are interested in completing C# tutorial, we encourage you simply to start here: C# Tutorial.



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