How To Compare Two Lists Using Regex?

问题

I Have Two Lists,

List<string>IDList //DM-0016 (ID:225),LPG Test (ID:232), 18S1(ID:290)..
List<string>Names // DM-0016,LPG Test, 18S1..

The Second List is basically the same as the First but it doesn't have the IDs. I am Showing the Second List in a Multiple Choice Dialog, Where, user can select multiple items.

I have a Regular Expression (@"(?<=\(ID:)[0-9]+"); This returns only the the number inside (ID:)

I want to compare these two Lists based on this RegEX, Where, I want only the ID's of the selected items.

For Ex: If DM-0061 is selected i'll get 225.

回答1:

If you use a regular expression such as:

(?<key>.*?)\s\(ID:(?<value>[0-9]+)\)

This regex translates to

A named capture group key consisting of:
- Any character any number of repetitions, but as few as possible
Whitespace
Literal (ID:
A named capture group value consisting of:
- Any number, one or more repetitions
Literal )

You can project your original list to a dictionary and easily use it as a lookup:

var list = new List<string>(){
    "DM-0016 (ID:225)","LPG Test (ID:232)", "18S1 (ID:290)"
};
var regex = new Regex(@"(?<key>.*?)\s\(ID:(?<value>[0-9]+)\)");

var dict = list.Select(i => regex.Match(i))
               .ToDictionary(
                    k => k.Groups["key"].Value, 
                    v => v.Groups["value"].Value);

Console.WriteLine(dict["DM-0016"]); // writes 225

Live example: http://rextester.com/PMTUFW14656

来源：https://stackoverflow.com/questions/51555021/how-to-compare-two-lists-using-regex

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