{"id":2517,"date":"2023-07-01T15:35:13","date_gmt":"2023-07-01T08:35:13","guid":{"rendered":"https:\/\/csharptutorial.net\/csharp-string-methods\/c-string-replace\/"},"modified":"2023-07-01T21:29:47","modified_gmt":"2023-07-01T14:29:47","slug":"csharp-string-replace","status":"publish","type":"page","link":"https:\/\/www.csharptutorial.net\/csharp-string-methods\/csharp-string-replace\/","title":{"rendered":"C# String Replace"},"content":{"rendered":"\n

Summary<\/strong>: in this tutorial, you will learn how to use the C# String Replace()<\/code> method to replace all occurrences of a specified substring in a string with a new substring.<\/p>\n\n\n\n

Introduction to the C# String Replace() method<\/h2>\n\n\n\n

The String Replace()<\/code> method allows you to replace all occurrences of a substring in a string<\/a> with a new substring. The Replace()<\/code> method has several overloads that allow you to customize the replacement operations. <\/p>\n\n\n\n

Here’s the basics syntax of the Replace()<\/code> method:<\/p>\n\n\n

public<\/span> string<\/span> Replace<\/span>(\n   string<\/span> oldValue, \n   string<\/span> newValue\n<\/span>)<\/span><\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
The Replace()<\/code> method takes two parameters:<\/p>\n\n\n\n
    \n
  • oldValue<\/code> represents the substring to be replaced.<\/li>\n\n\n\n
  • newValue<\/code> represents the replacement substring.<\/li>\n<\/ul>\n\n\n\n
    The Replace()<\/code> method returns a new string with all occurrences of the oldValue<\/code> replaced by the newValue<\/code>.<\/p>\n\n\n\n
    The following example shows how to use the Replace()<\/code> method to replace the substring \"hi\"<\/code> with the new substring \"bye\"<\/code> in the string \"hi hi hi\"<\/code>:<\/p>\n\n\n
    using<\/span> static<\/span> System.Console;\n\nvar<\/span> message = \"hi hi hi\"<\/span>;\nvar<\/span> newMessage = message.Replace(\"hi\"<\/span>, \"bye\"<\/span>);\n\nWriteLine(newMessage);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
    Output:<\/p>\n\n\n
    bye bye bye<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
    Note that the Replace()<\/code> does not modify the original string, it returns a new string with the substring oldValue<\/code> replaced by the new substring newValue<\/code>.<\/p>\n\n\n\n
    By default, the Replace()<\/code> method matches the string case-sensitively. To specify a rule for matching the string before replacement, you can use the following overload of the Replace()<\/code> method:<\/p>\n\n\n
    public<\/span> string<\/span> Replace<\/span> (\n    string<\/span> oldValue, \n    string<\/span>? newValue, \n    StringComparison comparisonType\n<\/span>)<\/span>;<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
    In this method, the comparisonType<\/code> accepts one of the members of the StringComparison<\/code> enum that specifies the rule that the method uses to match the oldValue<\/code> string.<\/p>\n\n\n\n
    For example, the following program uses the Replace()<\/code> method that uses the ordinal ignore case rule for replacing the substring \"Hi\"<\/code> with the new substring \"Bye\"<\/code> in the string \"Hi hi hi\"<\/code>:<\/p>\n\n\n
    using<\/span> static<\/span> System.Console;\n\nvar<\/span> message = \"Hi hi hi\"<\/span>;\nvar<\/span> newMessage = message.Replace(\n    \"Hi\"<\/span>, \n    \"Bye\"<\/span>, \n    StringComparison.OrdinalIgnoreCase\n);\n\nWriteLine(newMessage);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
    Output:<\/p>\n\n\n
    Bye Bye Bye<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
    Summary<\/h2>\n\n\n\n
      \n
    • Use the C# String Replace()<\/code> method to replace a substring in a string with a new substring.<\/li>\n<\/ul>\n
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