Regex question

[ccmike]

Hi,

How do I get the value in between 2 strings? I have a string with format d1048_m325 and I need to get the value between d and _. How is this done in C#?


Thanks,


Mike

 

[jmeckley]

Regex commands are located in the system.text.regularexpressions namespace.
off the top of my head it would look something like this

var input = "d1048_m325";
//^d\d+_ -> the first letter is d followed by 1 or more digits and then an underscore.
var match = Regex.Match(input, "^d\d+_");
if(match.Success == false) 
{
   return null;
}
var finalMatch = Regex.Match(match.Value, "\d+");
return int.Parse(finalMatch.Value);

if you know the number will be exactly 4 digits you can use this

var input = "d1048_m325";
//^d\d+_ -> the first letter is d followed by 4 digits and then an underscore.
var match = Regex.Match(input, "^d\d{4}_");
if(match.Success == false) 
{
   return null;
}
//the value is 'd1048_'. take the next 4 characters starting at the 2nd character
var result = match.Value.SubString(1, 4);
return int.Parse(result);

Jason Meckley
Programmer

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