C# Regex.Split is working differently than JavaScript - Stack Overflow

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I'm trying to convert this long JS regex to C#.

The JS code below gives 29 items in an array starting from ["","常","","に","","最新","、","最高"...]

var keywords = /(\ |[a-zA-Z0-9]+\.[a-z]{2,}|[一-龠々〆ヵヶゝ]+|[ぁ-んゝ]+|[ァ-ヴー]+|[a-zA-Z0-9]+|[ａ-ｚＡ-Ｚ０-９]+)/g;
var source = '常に最新、最高のモバイル。Androidを開発した同じチームから。';
var result = source.split(keywords);

But the C# code below gives a non-splitted single item in string[].

var keywords = @"/(\ |[a-zA-Z0-9]+\.[a-z]{2,}|[一-龠々〆ヵヶゝ]+|[ぁ-んゝ]+|[ァ-ヴー]+|[a-zA-Z0-9]+|[ａ-ｚＡ-Ｚ０-９]+)/g";
var source = @"常に最新、最高のモバイル。Androidを開発した同じチームから。";
var result = Regex.Split(source, keywords);

Many questions in Stack Overflow are covering relatively simple expressions only, so I cannot find my mistakes.

What am I missing?

I'm trying to convert this long JS regex to C#.

The JS code below gives 29 items in an array starting from ["","常","","に","","最新","、","最高"...]

var keywords = /(\ |[a-zA-Z0-9]+\.[a-z]{2,}|[一-龠々〆ヵヶゝ]+|[ぁ-んゝ]+|[ァ-ヴー]+|[a-zA-Z0-9]+|[ａ-ｚＡ-Ｚ０-９]+)/g;
var source = '常に最新、最高のモバイル。Androidを開発した同じチームから。';
var result = source.split(keywords);

But the C# code below gives a non-splitted single item in string[].

var keywords = @"/(\ |[a-zA-Z0-9]+\.[a-z]{2,}|[一-龠々〆ヵヶゝ]+|[ぁ-んゝ]+|[ァ-ヴー]+|[a-zA-Z0-9]+|[ａ-ｚＡ-Ｚ０-９]+)/g";
var source = @"常に最新、最高のモバイル。Androidを開発した同じチームから。";
var result = Regex.Split(source, keywords);

Many questions in Stack Overflow are covering relatively simple expressions only, so I cannot find my mistakes.

What am I missing?

• javascript
• c#
• regex
• cjk

Share Improve this question Follow edited Sep 4, 2018 at 8:01 Pang 10.1k146146 gold badges8686 silver badges124124 bronze badges asked Sep 4, 2018 at 1:58 YoungjaeYoungjae 25.1k1919 gold badges117117 silver badges203203 bronze badges

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2 Answers 2

Sorted by: Reset to default 15

Your RegEx is wrong, you should not start and end with '/' or '/g' You specify a string in the constructor, not a JavaScript Regex (with '/ /' syntax.). That's a Javascript syntax.

Actually the same applies to JavaScript when you use a string constructor like this:

var regex = new RegExp('//'); // This will match 2 slashes

Here is a C# example code

string keywords = @"(\ |[a-zA-Z0-9]+\.[a-z]{2,}|[一-龠々〆ヵヶゝ]+|[ぁ-んゝ]+|[ァ-ヴー]+|[a-zA-Z0-9]+|[ａ-ｚＡ-Ｚ０-９]+)";
string source = @"常に最新、最高のモバイル。Androidを開発した同じチームから。";
string [] res = Regex.Split(source, keywords);

string single = "";
foreach ( string str in res )
    single += "'" + str + "',";
Console.WriteLine("{0}", single);

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