Configure text output based on pattern

I'm working on a application that reads and writes to file based on config file created by user. As part of it, I want to output read text in provided by user pattern, and I can't figure out best way to do this.

Example:

Output patterns in config:

{Name} version: {1}{Name}_{1}

while:Name - will needs to be replaced with String variable value

1,2,3... - needs to be replaced with corresponding Regex Match Group value.

Regex.Replace doesn't really work for me. It would go well with attributes like {Name}, but I cannot convert a number to regex match group.

My second idea was to match pattern against {} values and replace them using switch case, but it doesn't look like the best idea:

Regex a = new Regex("{(.*)}");foreach (Match m in a.Matches(Pattern)){    switch (m.Groups[1].Value)    {        case "1":            {                                            return MatchedGroups[1].Value;            }        case "2":            {                                            return MatchedGroups[2].Value;            }        case "Name":            {                return Name;            }    }}

EDIT 1:

Example to ilustrate it better, what I have and what I want to obtain:

I have:

String InputText = "12/03/2015 *** [RandomText] // 1.04.1112V";String regex = @"([0-9/]*) \*\*\* \[([A-Za-z]*)\] \/\/ (.*)";  // #group 1 = 12/03/2015  // #group 2 = RandomText  // #group 3 = 1.04.1112VString Name = "GoogleChrome";String OutputPattern1 = "{1} - {Name} version {3}";String OutputPattern2 = "{Name}_{3}";

And having above variables and pattern I want to output:

#1 : 12/03/2015 - GoogleChrome version 1.04.1112V

#2 : GoogleChrome_1.04.1112V

Output Patterns will be created by user, so I cannot predict them.