I have a string like 'X:Y, a:B, C:D, M:N', how do I get a substring 'X, Y, C, M' from this? Always pick the first substring before :

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I have a string like 'X:Y,A:B,C:D,M:N', how do I get a substring 'X,Y,C,M' from this? Need to always pick the first substring before :

What I have tried:

I tried to split the string using ',' and then use IndexOf to get the substring before : using a foreach loop but not able to concatenate the string back to X,A,C,M

Posted 5-Apr-23 14:44pm

diadtp

Updated 5-Apr-23 15:26pm

PIEBALDconsult

v2

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PIEBALDconsult 5-Apr-23 20:57pm

I would use a Regular Expression.

diadtp 5-Apr-23 21:06pm

can you give an example?

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PIEBALDconsult · Accepted Answer · 2023-04-05T15:20:00

Something like this:

C#

System.Text.RegularExpressions.MatchCollection mat = 
System.Text.RegularExpressions.Regex.Matches 
( 
  @"X:Y,A:B,C:D,M:N" 
,
  @"(\w+?):"
,
  System.Text.RegularExpressions.RegexOptions.Compiled
) ;

System.Text.StringBuilder sb = new System.Text.StringBuilder() ;

for ( int i = 0 ; i < mat.Count ; i++ )
{
  sb.AppendFormat ( "{0}," , mat [ i ].Groups [ 1 ].Value ) ;
}

sb.Length-- ;

string res = sb.ToString() ;

Graeme_Grant · Accepted Answer · 2023-04-05T15:26:00

Here are another two ways:

C#

string text = "X:Y,A:B,C:D,M:N";

string[] parts = text.Split(',');

// This
string[] identifiers1 = parts
    .Select(part => part.Substring(0, 1))
    .ToArray();

Console.WriteLine(string.Join(", ", identifiers1));

// or this

string[] identifiers2 = new string[parts.Length];

for (int i = 0; i < parts.Length; i++)
{
    identifiers2[i] = parts [i].Substring(0,1);
}

Console.WriteLine(string.Join(", ", identifiers2));

Outputs:

X, A, C, M
X, A, C, M

I have a string like 'X:Y, a:B, C:D, M:N', how do I get a substring 'X, Y, C, M' from this? Always pick the first substring before :

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