how to do the following?

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i have a string filepath = "F:\first_folder\Node3_V_1.3"

i have a button named version_check

on the click of this button i want to print the message "UPGRADING Node3 to Version 1.3"(whose details are fetched from string filepath). how do i code this in C#.
please help me out.

1)the file to be fetched is in the standard format : Nodex_V_x.x, where x will be in the range 1-7.
2) the length of the variable filepath changes dynamically( depends on the path from where it is selected)

Posted 19-Sep-15 4:51am

Member 11961673

Updated 19-Sep-15 5:13am

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OriginalGriff · Answer 1 · 2015-09-19T05:21:00

Try a regex:

(?<FromVer>\d(\.\d)?)_V_(?<ToVer>\d(\.\d)?)$

Should do it.
If you want to restrict numbers to just 1 to 7, then replace "\d" with "[1-7]" throughout.

"what is regex? i m not aware of this . i want the code for the above mentioned problem since am very new to c#"

"Regex" is short for "Regular Expression Parser" and it is a tool for extracting "bits" of information from a string. In this case, it does some simple pattern matching and gets the info you want from the path string.

Get a copy of Expresso[^] - it's free, and it examines and generates Regular expressions.

It also generates C# code for you!

C#

public static Regex findVersions = new Regex("(?<FromVer>[1-7](\\.\\d)?)_V_(?<ToVer>\\d(\\.\\d)?)$");
...
   Match m = findVersions.Match(filepath);
   if (m.Success)
      {
      string fromVer = m.Groups["FromVer"].Value;
      string toVer = m.Groups["ToVer"].Value;
      ...
      }