Parse integer from string containing letters and spaces - C#
What is the most efficient way to parse an integer out of a string that contains letters and spaces?
Example: I am passed the following string: "RC 272". I want to ret开发者_Go百科rieve 272 from the string.
I am using C# and .NET 2.0 framework.
A simple regex can extract the number, and then you can parse it:
int.Parse(Regex.Match(yourString, @"\d+").Value, NumberFormatInfo.InvariantInfo);
If the string may contain multiple numbers, you could just loop over the matches found using the same Regex:
for (Match match = Regex.Match(yourString, @"\d+"); match.Success; match = match.NextMatch()) {
x = int.Parse(match.Value, NumberFormatInfo.InvariantInfo); // do something with it
}
Since the format of the string will not change KISS:
string input = "RC 272";
int result = int.Parse(input.Substring(input.IndexOf(" ")));
Just for the fun of it, another possibility:
int value = 0;
foreach (char c in yourString) {
if ((c >= '0') && (c <= '9')) {
value = value*10+(c-'0');
}
}
If it will always be in the format "ABC 123":
string s = "RC 272";
int val = int.Parse(s.Split(' ')[1]); // val is 272
EDIT:
If it will always be in that format wouldn't something like the following work where value = "RC 272"?
int someValue = Convert.ToInt32(value.Substring(value.IndexOf(' ') + 1));
Guys, since it will always be in the format "ABC 123", why not skip the IndexOf step?
string input = "RC 272";
int result = int.Parse(input.Substring(3));
精彩评论