finding a substring in a list of strings

Question

I have a list of strings and i have multiple strings added to it . ex: l1 is a list with three values

List<string> l1 = new List<string> 
{
     "issue: there are multiple data errors ",
     "resolution: you can correct the data or /n raise an SR on this issue",
     "rootfix: you need to be contious while entering the data "
};

Now i need to check if this list has got all three key strings ie.

List<string> keyWords = new List<string> { "isue", "resolution", "rootfix" };

I dont think i can use Contains operation on this as the above strings are substrings of the list strings.

Please let me know if there is any function available /logic.

If all the three substrings are there in the list then i need to return boolian

You can use StartsWith()-> learn.microsoft.com/en-us/dotnet/api/… — panoskarajohn
– panoskarajohn, Commented Jan 7, 2020 at 14:08
What's wrong with using Contains? You can just use it in a loop — Aousaf Rashid
– Aousaf Rashid, Commented Jan 7, 2020 at 14:13
@Aousafrashid contains needs full string to check . but i have to check with only substrings and there are multiple substrings — Abhishek
– Abhishek, Commented Jan 7, 2020 at 14:16
"I dont think i can use contains operation" you can but not the IEnumerable.Contains method but the String.Contains method — Mong Zhu
– Mong Zhu, Commented Jan 7, 2020 at 14:20

Mong Zhu · Accepted Answer · 2020-01-07 14:22:15Z

2

You can check whether All keywords match in Any item of your wordset that might String.Contains your key word

List<string> keyWords = new List<string>{"issue","resolution","rootfix"};

List<string> wordSet = new List<string>{"issue: there are multiple data errors ", "resolution: you can correct the data or /n raise an SR on this issue", "rootfix: you need to be contious while entering the data "};

bool result = keyWords.All(x => wordSet.Any(w => w.Contains(x)));

For a human being it is probably easier to read from inside out

edited Jan 7, 2020 at 14:22

answered Jan 7, 2020 at 14:17

Mong Zhu

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Comments

Martin · Accepted Answer · 2020-01-07 14:15:59Z

I'm not 100% clear on whether your example is showing three separate strings in your List<string>, or whether they are one single string.

In the first case, three separate strings in a List<string>, you could use something like:

bool isInList = l1.Any(x => x.StartsWith("issue")) &&
                l1.Any(x => x.StartsWith("resolution")) &&
                l1.Any(x => x.StartsWith("rootfix"));

This will return true if all of the matching strings are found in l1.

If it is the second case, and a single string containing the values as you described them:

string l1 = "{\"issue: there are multiple data errors \", \"resolution: you can correct the data or /n raise an SR on this issue\", \"rootfix: you need to be contious while entering the data \"}";
bool isInString = l1.Contains("\"issue") &&
                  l1.Contains("\"resolution") &&
                  l1.Contains("\"rootfix"))

This will return true where all three names appear in the same string.

KekuSemau · Accepted Answer · 2020-01-07 14:16:27Z

0

This should work:

var data = new []{"issue: there are multiple data errors ", "resolution: you can correct the data or /n raise an SR on this issue", "rootfix: you need to be contious while entering the data "};

bool flag = (
    data.Any(d => d.StartsWith("issue:")) &&
    data.Any(d => d.StartsWith("resolution:")) &&
    data.Any(d => d.StartsWith("rootfix:"))
    );

answered Jan 7, 2020 at 14:16

KekuSemau

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Comments

Matheus Oliveira · Accepted Answer · 2020-01-07 14:19:18Z

0

Can you use LINQ? Just using Where() and String.StartsWith() you can achieve this!

        var list = new List<string> {
            "issue: test1",
            "resolution: test2",
            "rootfix: test3"
        };

        var issues = list.Where(x => x.StartsWith("issue"));

        foreach(var i in issues) {
            Console.WriteLine(i);
        }

        Console.Read();

OUTPUT: "issue: test1"

answered Jan 7, 2020 at 14:19

Matheus Oliveira

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