The behavior of Regex String.split(/\s*/) varies between JavaScript and C# programming languages

Question

The behavior of Regex String.split(/\s*/) varies between JavaScript and C# programming languages

When comparing a Regex in JS and C#, I noticed that they do not produce the same results:

//javascript
var password = "pass";
var arrPws = password.split(/\s*/);

This gives me a String[] result like what you see here

However, when attempting to replicate it in C#, the output is slightly different:

//c#
using System.Text.RegularExpressions;

var password = "pass";
var arrPwd = Regex.Split(password,@"\s*");

The C# code adds an extra "" at the beginning and end as shown here
What steps can I take to eliminate the additional "" in C#?

javascript c#.net regex razor

Answer 1

Answer №1

To quickly resolve the issue with your .NET code, you can split on (?<=.)\s*(?=.):

using System.Text.RegularExpressions;

var password = "pass";
var arrPwd = Regex.Split(password, @"(?<=.)\s*(?=.)");
foreach(var item in arrPwd)
{
    Console.WriteLine(item.ToString());
}

This will output:

p
a
s
s

The problem is related to how \s* behaves. In .NET's regex engine, \s* matches the zero width markers at the beginning and end of the input, which differs from JavaScript's engine.

If you simply want an array containing all characters in the string, you can use string#ToCharArray().

Answer 2

To quickly resolve the issue with your .NET code, you can split on (?<=.)\s*(?=.):

using System.Text.RegularExpressions;

var password = "pass";
var arrPwd = Regex.Split(password, @"(?<=.)\s*(?=.)");
foreach(var item in arrPwd)
{
    Console.WriteLine(item.ToString());
}

This will output:

p
a
s
s

The problem is related to how \s* behaves. In .NET's regex engine, \s* matches the zero width markers at the beginning and end of the input, which differs from JavaScript's engine.

If you simply want an array containing all characters in the string, you can use string#ToCharArray().

The behavior of Regex String.split(/\s*/) varies between JavaScript and C# programming languages

Answer №1

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