Picking certain strings of an array with C#

Question

我试图在数组中选择paticular字符串并将它们添加到一个新数组中，例如我想获取包含.txt和.rtf的数组中的所有字符串，并将它们添加到新数组中，例如filteredStrings []

Answer 1

You do not need regex for something that simple: Contains works faster, and is easier to understand:

var filteredStrings = myStrings.Where(s => s.Contains(".txt") || s.Contains(".rtf")).ToArray();

If you insist on using regex, you can do this:

var regexp = new Regex("[.](txt|rtf)");
var filteredStrings = myStrings.Where(s => regexp.IsMatch(s)).ToArray();

Answer 2

myArray.Where(x => Regex.IsMatch(x, @"\.(txt|rtf)$")).ToArray()