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  1. using System;
  2. using System.Text;
  3. using System.Collections.Generic;
  4.  
  5. public class Test
  6. {
  7.     public static string Replace(string input, ref int pos, IDictionary<string,string> vars, bool stopOnClose = false) {
  8.         var res = new StringBuilder();
  9.         while (pos != input.Length) {
  10.             switch (input[pos]) {
  11.                 case '\\':
  12.                     pos++;
  13.                     if (pos != input.Length) {
  14.                         res.Append(input[pos++]);
  15.                     }
  16.                     break;
  17.                 case ')':
  18.                     if (stopOnClose) {
  19.                         return res.ToString();
  20.                     }
  21.                     res.Append(')');
  22.                     pos++;
  23.                     break;
  24.                 case '$':
  25.                     pos++;
  26.                     if (pos != input.Length && input[pos] == '(') {
  27.                         pos++;
  28.                         var name = Replace(input, ref pos, vars, true);
  29.                         string replacement;
  30.                         if (vars.TryGetValue(name, out replacement)) {
  31.                             res.Append(replacement);
  32.                         } else {
  33.                             res.Append("<UNKNOWN:");
  34.                             res.Append(name);
  35.                             res.Append(">");
  36.                         }
  37.                         pos++;
  38.                     } else {
  39.                         res.Append('$');
  40.                     }
  41.                     break;
  42.                 default:
  43.                     res.Append(input[pos++]);
  44.                     break;
  45.             }
  46.         }
  47.         return res.ToString();
  48.     }
  49.     public static void Main() {
  50.         const string input = "Here is a test string contain $(variableA) and $(variableB$(variableC))";
  51.         var vars = new Dictionary<string, string> {
  52.             {"variableA", "A"}, {"variableB", "B"}, {"variableC", "C"}, {"variableBC", "Y"}
  53.         };
  54.         int pos = 0;
  55.         Console.WriteLine(Replace(input, ref pos, vars));
  56.     }
  57. }
Success #stdin #stdout 0.03s 33872KB
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Standard input is empty
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Here is a test string contain A and Y
https://ideone.com/Dysz3n
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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