C# Check string for specific length of numbers -


i have ability search , return files in given file location. have ability return number sequence file name such:

   public list<availablefile> getavailablefiles(string rootfolder)     {          list<availablefile> files = new list<availablefile>();         if (directory.exists(rootfolder))         {             log.info("checking folder: " + rootfolder + " files");             try             {                 foreach (string f in directory.getfiles(rootfolder))                 {                     files = fileupload.createfilelist(f);                     var getnumbers = new string(f.where(char.isdigit).toarray());                      system.diagnostics.debug.writeline(getnumbers);                 }             }             catch (system.exception excpt)             {                 log.fatal("getavailablefiles failed: " + excpt.message);             }         }         return files;     }

what want return sequence of numbers 8 characters long. example file name new file1 12345678 123 i'm caring getting 12345678 back.

how can modify method achieve this?

a regex seems this:

var r = new regex(".*(\\d{8})"); foreach (string f in directory.getfiles(rootfolder)) {     files = fileupload.createfilelist(f);     var match = r.match(f);     if(m.success)     {         console.writeline(m.groups[1]); // aware index 0 contains entire matched string     } }

the regex match first occurence of 8 digits , put groupscollection.


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