my current scenario is , I have a string like "XYZName" but it should take only first 3 character and in those 3 character there shouldn't be any special character.
Example : "XYZName" result should be: XYZ
and another requremnt is Example : "X.YZName" or "XY-ZName" result should be: XYZ
first example is done but not able to implement second example. my code is
comName = (comName .Replace(".", string.Empty).Length >= 3
? comName .Replace(" ", string.Empty).Substring(0, 3)
: comName .Replace(" ", string.Empty)).ToUpper();
how to do this ?? Thanks in advance
Update after comment that digits are also allowed
comName = Regex.Replace(comName, @"[^a-zA-Z\d]", "").Substring(0, 3);
The regular expression uses a negated set, so any character other than az
, AZ
or a digit ( \\d
) will be removed.
After the characters are removed, Substring
takes the first 3.
If you're using C#8+ you could replace the Substring
with a Range:
comName = Regex.Replace(comName, @"[^a-zA-Z\d]", "")[..3];
You can make sure to first match 3 times a char AZ with optional chars other than AZ or a whitespace char in between:
^[A-Z][^\sA-Z]*[A-Z][^\sA-Z]*[A-Z]
See a regex demo for the matches.
Then from those matches, remove all chars other than AZ:
var regex = new Regex(@"^[A-Z][^\sA-Z]*[A-Z][^\sA-Z]*[A-Z]");
string[] strings = {"XYZName", "X.YZName", "XY-ZName"};
foreach (String s in strings)
{
var m = regex.Match(s);
if (m.Success) {
Console.WriteLine(Regex.Replace(m.Value, @"[^A-Z]+", ""));
}
}
Output
XYZ
XYZ
XYZ
See a C# demo .
Or you can use 3 capture groups and directly print the value of the groups.
^([A-Z])[^\sA-Z]*([A-Z])[^\sA-Z]*([A-Z])
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