CODEWITHSUNDEEP
c#stringcontains
kind-mug
kind-mug

Reputation: 97

Check if string contains strictly a string

I've a string looking like this : str = P1|P2|P3....

I need to check if the string contains for instance P1. I do that :

if (str.Contains("P1"))
{...}

My issue comes when I look for P1 and str does not contains P1 but P10, it returns true, which is logical, but not what I need.

How can I check strictly for P1 without returning true if I have P10 in the string.

Thanks for your help

Upvotes: 0

Views: 706

Answers (6)

sebekkz
sebekkz

Reputation: 31

You have to check if string you are looking for is followed by '|' or is at the end of the string in which you check.

String str = "P1|P3|P20";
String strToFind = "P2";
System.Text.RegularExpressions.Regex.IsMatch(str, strToFind+@"(\||\Z)");

Upvotes: 0

Patrick Allwood
Patrick Allwood

Reputation: 1832

Might be a good case for using a regex, as you need to make sure that the string you are looking for is delimited by either a pipe or the end of the string.

For example:

string input = "P1|P2|P3|P10";
string pattern = @"P1(\||$)";
Regex.IsMatch(input, pattern);

Upvotes: 0

Joey
Joey

Reputation: 354536

If you need to check for P10 as well, then do so in reverse order, which means you'd pick up P10 before P1.

If every Psomething is followed by a | you can check for P1|. This won't work if it's a separator and won't appear at the very end of the string.

A regex would be another solution:

Regex.IsMatch(str, "P1(?!\d)") // Matches P1 if not followed by another digit

Generally, if you run into this problem, it's a poor choice of data structures, though. A string isn't exactly a collection of things and that's what you're trying to model here.

Upvotes: 2

Rajeev Kumar
Rajeev Kumar

Reputation: 4963

You can split the string into array and then check like this

bool bFound = str.split('|').Contains("p1")

Upvotes: 3

dav_i
dav_i

Reputation: 28107

Why not split the string and check against that:

string input = "P1|P2|P3|P10";

string[] split = input.Split('|'); // { "P1", "P2", "P3", "P10" }

bool containsP1 = split.Contains("P1"); // true

Upvotes: 1

Giannis Paraskevopoulos
Giannis Paraskevopoulos

Reputation: 18411

str.Split('|').Contains("P1");

Upvotes: 0

Related Questions