Question

I want to define a variable in my regular expression in a way that I can simply extract its corresponding value from matched input string.

For example, I have a pattern like this: "\w*\s+\d+",

And an input string like: "aaa 113"

When the matching string is received, I want to be able to simply extract the value corresponds to the part of pattern which says "\d+" which is numerical value using C#

Need to mention that I am storing expressions in a database table and I want to extract variables from matched strings and pass their values to a dynamically retrieved query or stored procedure.

I want to the procedure to be completely context-free as we don’t the occurrence place of variables and their values in matching string.

Answer 1

You can use match groups with names without depending on its order in the pattern:

Match match = Regex.Match("aaa 113", @"(?<word>\w*)(?<space>\s+)(?<num>\d+)");
string words = match.Groups["word"].Value;              //"aaa"
string spaces = match.Groups["space"].Value;            //" "
string nums = match.Groups["num"].Value;                //"113"