split string test

splitstrtest.cs

using System.Text;
// space(U+0020),tab(U+0009),fullwidth space(U+3000),linefeed(U+000a)
var str = "a b\tc　d\n";
foreach(var x in str.Split(' '))
{
    Console.WriteLine($"a: '{x}'");
}

foreach(var x in str.Split(null))
{
    Console.WriteLine($"b: '{x}'");
}

foreach(var x in str.Split(""))
{
    Console.WriteLine($"c: '{x}'");
}

foreach(var x in str.Split(new char[0]))
{
    Console.WriteLine($"d: '{x}'");
}

foreach(var x in str.Split(default(string[]), StringSplitOptions.None))
{
    Console.WriteLine($"e: '{x}'");
}

foreach(var x in str.Split(new string[0], StringSplitOptions.None))
{
    Console.WriteLine($"f: '{x}'");
}

foreach(var x in str.Split(new string[]{ "" }, StringSplitOptions.None))
{
    Console.WriteLine($"g: '{x}'");
}

zz-result.txt

a: 'a'
a: 'b	c　d
'
b: 'a'
b: 'b'
b: 'c'
b: 'd'
b: ''
c: 'a b	c　d
'
d: 'a'
d: 'b'
d: 'c'
d: 'd'
d: ''
e: 'a'
e: 'b'
e: 'c'
e: 'd'
e: ''
f: 'a'
f: 'b'
f: 'c'
f: 'd'
f: ''
g: 'a b	c　d
'