MATLAB: Give labels according to string

string

I have a cell array of strings with the following pattern
    String	        Label
'Abc\a1\L\XYZ1R08'	1
'Abc\a1\R\XYZ1R09'	1
'Abc\a1\R\XYZ1R10'	1
'Abc\b2\L\XYZ2L01'	2
'Abc\b2\R\XYZ2L02'	2
'Abc\b2\R\XYZ2L03'	2
'Abc\c3\L\XYZ2L04'	3
'Abc\c3\R\XYZ2L05'	3
'Abc\d4\L\XYZ2L06'	4
'Abc\d4\R\XYZ2L07'	4
i wanted to give a new variable, "Label', values according to a1,b2,c3,d4, etc

Best Answer

Try this: 
String = {'Abc\a1\L\XYZ1R08'
'Abc\a1\R\XYZ1R09'	
'Abc\a1\R\XYZ1R10'	
'Abc\b2\L\XYZ2L01'	
'Abc\b2\R\XYZ2L02'	
'Abc\b2\R\XYZ2L03'	
'Abc\c3\L\XYZ2L04'	
'Abc\c3\R\XYZ2L05'	
'Abc\d4\L\XYZ2L06'	
'Abc\d4\R\XYZ2L07'};
grpstr = regexp(String, '(?<=\\)\w{2}', 'once','match');    % Get Two Letters After First ‘\’
Group = findgroups(grpstr);
Result = {String, Group}                                    % Cell Array
T1 = table(string(String), Group)                           % Table
producing: 
T1 =
  10×2 table
           Var1           Group
    __________________    _____
    "Abc\a1\L\XYZ1R08"      1  
    "Abc\a1\R\XYZ1R09"      1  
    "Abc\a1\R\XYZ1R10"      1  
    "Abc\b2\L\XYZ2L01"      2  
    "Abc\b2\R\XYZ2L02"      2  
    "Abc\b2\R\XYZ2L03"      2  
    "Abc\c3\L\XYZ2L04"      3  
    "Abc\c3\R\XYZ2L05"      3  
    "Abc\d4\L\XYZ2L06"      4  
    "Abc\d4\R\XYZ2L07"      4
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