如何从字符串C＃中提取数字

Question

I have a string

"transform(23, 45)"

from this string i have to extract 23 and 45, i did

var xy = "transform(23,45)".Substring("transform(23,45)".indexOf('(') + 1).TrimEnd(')');
var num = xy.Split(',');

I am using c#. Is there any better method to do this in c#?

Answer 1

Use a Regular Expression:

string sInput = "transform(23, 45)";
Match match = Regex.Match(sInput, @"(\d)+",
              RegexOptions.IgnoreCase);

if (match.Success)
{
    foreach (var sVal in match)
             // Do something with sVal
}

You can read more on Regular Expressions here . Use RegExr for training, it helps alot!

Answer 2

Well, a simply regular expression string would be ([0-9]+) , but you may need to define other expression constraints, eg, what are you doing to handle periods, commas, etc in strings?

var matches = Regex.Matches("transform(23,45)", "([0-9]+)");
foreach (Match match in matches)
{  
    int value = int.Parse(match.Groups[1].Value);
    // Do work.
}

Answer 3

这会做到的

string[] t = "transform(23, 45)".ToLower().Replace("transform(", string.Empty).Replace(")", string.Empty).Split(',');

Answer 4

Use Regex :

var matches = Regex.Matches(inputString, @"(\d+)");

explain:

\d    Matches any decimal digit.

\d+   Matches digits (0-9) 
      (1 or more times, matching the most amount possible) 

and for using:

foreach (Match match in matches)
{  
    var number = match.Groups[1].Value;
}