How does C # detect what numbers are in a string string?

how does C # detect what numbers are in a string string?

  Test function        private void Form1_Load (object sender, EventArgs e)        {            foreach (var number in Extractnumbersfromstring ("abc2345 345fdf678 jdhfg945"))            {                MessageBox.Show (number. ToString ());            }        }        Private Ienumerable<int> extractnumbersfromstring (string s)        {            //regex.matches Method: Searches the input string for all occurrences of the regular expression and returns all matches.            matches the preceding character or sub-expression one or more times. Equivalent to {1,}. If the + is removed, it is            //return regex.matches (S, @ "\d+"). Cast<match> (). Select (M = Convert.ToInt32 (M.value));            Return Regex.Matches (S, @ "\d"). Cast<match> (). Select (M = Convert.ToInt32 (M.value));        }

"Abc2345 345fdf678 jdhfg945"
The above example test, there is a plus, this output:

2345  345678945

When there is no +, the output is this:

23453 .....

The above is how C # detects what numbers are in string strings? For more information, please pay attention to topic.alibabacloud.com (www.php.cn)!

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