C＃使用正则表达式获取多个匹配项

Question

var userVersionHTML = "2448hello2448welcome2448";
Regex regex = new Regex("2448(.*?)2448");
var v = regex.Match(userVersionHTML);
versionNumberStatus.Text = v.Groups[1].ToString();
usernameStatus.Text = v.Groups[2].ToString();

The goal is to get versionNumberStatus.Text to display 'hello' and for usernameStatus.Text to display 'welcome'.

The issue is that nothing appears for the usernameStatus.Text . Any ideas?

Answer 1

You only have one capturing group here, in "2448(.*?)2448" pattern so you cannot access .Groups[2] .

A solution is to either split with 2448 or use the 2448(.*?)2448(.*?)2448 pattern.

See the regex demo .

Or this C# code:

var userVersionHTML = "2448hello2448welcome2448";
var chunks = userVersionHTML.Split(new[] {"2448"}, StringSplitOptions.RemoveEmptyEntries); 
var versionNumberStatus = chunks[0];
var usernameStatus = chunks[1];

Answer 2

A solution is to use Matches() with a regex like this:

var userVersionHTML = "2448hello2448welcome2448";

Regex regex = new Regex("(2448)?(.*?)2448");
var v = regex.Matches(userVersionHTML);

versionNumberStatus.Text = v[0].Groups[2].ToString();
usernameStatus.Text = v[1].Groups[2].ToString();