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C# Determine if a char at index is between two characters in a string

By : mitman12
Date : September 29 2020, 05:00 AM
Hope this helps Based on the information given, and from what I understand about your question, you want an extension method for strings.
Something like this:
code :
public class Program
    public static void Main()
        var isBetween = "abc".IsBetween(1, 'a', 'c');
        Console.WriteLine(isBetween); //True

public static class Extensions
    public static bool IsBetween(this String str, int index, char start, char end)
        var left = str[index - 1];
        var right = str[index + 1];
        return left == start && right == end;

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Determine Logical Line From Char Index (Winforms TextBox)

By : Petra
Date : March 29 2020, 07:55 AM
will help you Find the number of occurrences of newlines in the entire text up to your char index.
Perhaps first take the substring of the textbox's text up to your char index. Use Split on newlines, and count the result.

How can I determine the index in codepage 850 for a char in C#?

By : Fin
Date : March 29 2020, 07:55 AM
Hope this helps Use Encoding.GetBytes() on the line. CP850 is an 8-bit encoding, so the byte array should have just as many elements as the string had characters, and each element is the value of the character.

Determine if string has any characters that aren't in a list of characters and if so, which characters don't match?

By : Sandy Boy
Date : March 29 2020, 07:55 AM
will be helpful for those in need If you just want to check if the string is valid, you can use RegExp.test() - this is more efficient that exec() as it will return true when it finds the first occurrence:
code :
var value = "abc$de%f";

// checks if value contains any invalid character
if(/[^A-Za-z0-9]/.test(value)) {
var value = "abc$de%f";

var invalidChars = value.match(/[^A-Za-z0-9]/g);

alert('The following characters are invalid: ' + invalidChars.join(''));

Determine JSONPath from char index

By : Y.Ahmed
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I think NewtonSoft's JsonTextReader can give you what you want, using the Path, LineNumber and LinePosition properties.
This code for example:
code :
var s = @"
        ""obj"": {
            ""foo"": ""bar""
        ""arr"": [
using(var sr = new System.IO.StringReader(s))
    var r = new Newtonsoft.Json.JsonTextReader(sr);
    while (r.Read())
        Console.WriteLine(r.LineNumber + ":" + r.LinePosition + " : " + r.Path);
2:5 : 
3:14 : obj
3:16 : obj
4:18 : obj.foo
4:24 : obj.foo
5:9 : obj
6:14 : arr
6:16 : arr
7:13 : arr[0]
8:13 : arr[1]
9:13 : arr[2]
10:9 : arr
11:5 : 
var charIndex = 48;
var s = @"
        ""obj"": {
            ""foo"": ""bar""
        ""arr"": [
s = s.Replace("\n", " ").Replace("\r", " ");
var path = "";
using(var sr = new System.IO.StringReader(s))
    var r = new Newtonsoft.Json.JsonTextReader(sr);
    while (r.Read() && r.LinePosition <= charIndex )
        path = r.Path;
Console.WriteLine(path); // obj.foo

How to determine string S can be made from string T by deleting some characters, but at most K successive characters

By : Simon
Date : March 29 2020, 07:55 AM
wish of those help (Update: I've rewritten the opening of this answer to include a discussion of complexity and to discussion some alternative methods and potential risks.)
(Short answer, the only real improvement above the O(nm) approach that I can think of is to observe that we don't usually need to compute all n times m entries in the table. We can calculate only those cells we need. But in practice it might be very good, depending on the dataset.)
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