How to remove special character set prefix in list using linq

Question

_{Friday, July 20, 2018 7:30 AM}

Hi All, 

Please help me to remove special character set prefix in below string list here. 

i have below list here. 

 List<string> removalPattern = new List<string>();
            removalPattern.Add(@"[__]");
            string studentInfo = "[__] Student Attendance \n[__] Student Lunch Time\n(**) Parents Meeting Date \n[__] Student Play time\n[__] Student Library time, \n(**) Parents Observation \n";
            var StudentList = Regex.Split(studentInfo, "\n").Where(s => s.Contains(removalPattern[0]) && s != string.Empty).ToArray();

in 'StudentList' i am getting each string with "[__]" prefix. i don't need this prefix. please help me to remove this prefix for each string in list.

Thanks,

Chandu

All replies (3)

_{Friday, July 20, 2018 2:42 PM}

To remove an arbitrary character from the front of a string use TrimStart. To remove from the back use TrimEnd. To remove from both use Trim.

var studentList = from s in Regex.Split(...)
                  select s.TrimStart('_');


 

Michael Taylor http://www.michaeltaylorp3.net

_{Saturday, July 21, 2018 9:31 AM}

Using the string.Replace() method might me a bit more straightforward:

string studentInfo = 
    "[__] Student Attendance " + 
    "\n[__] Student Lunch Time" + 
    "\n(**) Parents Meeting Date " +
    "\n[__] Student Play time" +
    "\n[__] Student Library time, " +
    "\n(**) Parents Observation \n";

var StudentList = Regex.Split(studentInfo
                       .Replace("[__]","")
                       .Replace("(**)",""), "\n")
                       .Where(s => !string.IsNullOrEmpty(s));
StudentList.ToList().ForEach(Console.WriteLine);

You can chain together successive calls to the Replace method to perform multiple replacements on the original string. In this case I deleted the "(**)" string, too.

wizend

_{Monday, July 23, 2018 7:00 AM}

Hi Chandu,

Also you can remove the prefix for each item in the student list:

    List<string> removalPattern = new List<string>();
    removalPattern.Add(@"[__]");
    string studentInfo = "[__] Student Attendance \n[__] Student Lunch Time\n(**) Parents Meeting Date \n[__] Student Play time\n[__] Student Library time, \n(**) Parents Observation \n";
    
    var StudentList = Regex.Split(studentInfo, "\n").Where(s => s.Contains(removalPattern[0]) && s != string.Empty).ToArray();

    List<string> MyStudentList = new List<string>();
    foreach (var item in StudentList)
    {
        MyStudentList.Add(item.Remove(0, 4));
    }

Now the MyStudentList is what you want.

Regards,

Stanly

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