How Can I Split Strings by Multi-Character Delimiters in C#?

Split string using multi-character delimiter in C#

Splitting a string using delimiters is a common task in programming. But what if the required separator consists of multiple characters (e.g. a word)?

Comparison of Java and C#

In Java, use the String.split() method to directly split a string using the string delimiter:

<code class="language-java">String sentence = "This is a sentence.";
String[] split = sentence.split("is");</code>

However, in C#, the String.Split() method only accepts single-character delimiters.

Solution using StringSplitOptions

To split a string using multi-character delimiter in C#, you can use the StringSplitOptions.None enumeration value and the String.Split() method:

<code class="language-csharp">string source = "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]";
string[] stringSeparators = new string[] {"[stop]"};
string[] result;

// ...
result = source.Split(stringSeparators, StringSplitOptions.None);

foreach (string s in result)
{
    Console.Write("'{0}' ", String.IsNullOrEmpty(s) ? "" : s);
}</code>

In this example, source contains a string in which the string "[stop]" appears multiple times as a delimiter. The code uses String.Split() to split the string into an array of substrings. The StringSplitOptions.None value ensures that the delimiter string is treated as a single delimiter, even if it contains multiple characters.

With this technique you can easily split strings using multi-character delimiters in C#. The output will be words separated by "[stop]".

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