Develop Reference

Need to extract data from a variable seperated by back slashes

I have a variable that I need to extract data from separated by a back slash.
My variable data would be
A\123\FRONT\BACK\49585856
I need to extract the second piece based on the back slashes
Thanks in advance!
I haven't tried anything yet since I am having trouble finding documention

as #rufus said
string x = #"A\123\FRONT\BACK\49585856";
string[] b = x.Split('\\');
Console.WriteLine(b[2]);

The method you need is Split
Split is used to break a delimited string into substrings. You can use either a character array or a string array to specify zero or more delimiting characters or strings. If no delimiting characters are specified, the string is split at white-space characters.
using System;
public class SplitExample
{
public static void Main(string[] args)
{
const char separator = '\\';
string data = #"A\123\FRONT\BACK\49585856";
string[] myVariables = data.Split(separator);
Console.WriteLine(myVariables[1]); // myVariables[1] = 123
}
}
Altought if you always need only the second element:
The Split method is not always the best way to break a delimited string into substrings. If you don't want to extract all of the substrings of a delimited string, or if you want to parse a string based on a pattern instead of a set of delimiter characters, consider using regular expressions, or combine one of the search methods that returns the index of a character with the Substring method. For more information, see Extract substrings from a string.

C# - Split a string separated by ':'

Im trying to split this string:
PublishDate: "2011-03-18T11:08:07.983"
I tried Split method but it's not successful.
str.Split(new[] { ':', ' ' }, StringSplitOptions.RemoveEmptyEntries)
As a result I get PublishDate 2011-03-18T11 08 07.983
But correct result is PublishDate 2011-03-18T11:08:07.983
What i need to do?

Split(String, Int32, StringSplitOptions)
Splits a string into a maximum number of substrings based on a specified delimiting string and, optionally, options.
str.Split(':', 2, StringSplitOptions.RemoveEmptyEntries)
https://learn.microsoft.com/en-us/dotnet/api/system.string.split?view=net-6.0#system-string-split(system-string-system-int32-system-stringsplitoptions)

I would solve like this:
locate the index of the first :. The property name will be all the characters before this, which you can extract with Substring and Trim to remove whitespace before the colon, if present.
locate the index of the first " and last ". Characters between the first and last quotes are the property value.
string input = "PublishDate: \"2011-03-18T11:08:07.983\"";
int iColon = input.IndexOf(':');
int iOpenQuote = input.IndexOf('"', iColon);
int iCloseQuote = input.LastIndexOf('"');
string propertyName = input.Substring(0, iColon).Trim();
string propertyValue = input.Substring(iOpenQuote + 1, iCloseQuote - iOpenQuote - 1);
This does not handle escaped characters within the property value (for example, to embed a literal quote or newline using a typical escape sequence like \" or \n). But it's likely good enough to extract a date/time string, and permits all characters because of the use of LastIndexOf. However, this is not robust against malformed input, so you will want to add checks for missing colon, or missing quote, or what happens when the close quote is missing (same same index for start and end quote).

So if I got you right, you want as a result: PublishDate 2011-03-18T11:08:07.983.
Then I would recommend you to use the string.Replace method.
using System;
public class HelloWorld
{
public static void Main(string[] args)
{
string yourData = "PublishDate: \"2011-03-18T11:08:07.983\"";
// First replace the colon and the space after the PublishDate with and space
// then replace the quotes from the timestamp -> "2011-03-18T11:08:07.983"
yourData = yourData.Replace(": ", " ").Replace("\"", "");
// Output the result -> PublishDate 2011-03-18T11:08:07.983
Console.WriteLine(yourData);
}
}

How to split a string that has own specific rule in c#?

I have a string like XXXXmakeXXmodel nameXXageXX**** for a car data. I want to get make, model name and age.
So can I split this using regex or another way in c#?

You can convert the string to an array of keyword / value based on key words
for example: XXXXmakeXXmodel
Identify that it does not start with a keyword
Take the value before the keyword
Take the keyword
repeat until you have processed the entire string.
You need to use the String.IndexOf and Substring methodes.

You can split string using Split() function with a delimiter i.e. "XX".
var input = "XXXXmakeXXmodel nameXXageXX****";
//Split string by "XX" and remove empty entries
var array = input.Split("XX", StringSplitOptions.RemoveEmptyEntries);
//Take first n - 1 elements to avoid last ****
var result = array.Take(array.Length - 1);
//Print expected result.
Console.WriteLine(string.Join(Environment.NewLine, result));
.NET FIDDLE

Get a specific value from comma separated string

I have a instrument which returns me a string value as this
string var = "0,0,0.1987,22.13";
I want to use only the 4th value "22.13". I tried with Trim() and Replace() methods but couldn't exactly get what I want. How to achieve this?

The Split method is the best to use here!
The Split method does what it says on the lid. It splits a string into different parts at a character separator that you specify. e.g. "Hello World".Split(' ') splits the string into a string[] that contains {"Hello", "World"}.
So in this case, you can split the string by ',':
var.Split (',') //Use single quotes! It's of type char
If you want to access the fourth item, use an indexer! (of course)
var.Split(',')[3] //Remember to use 3 instead of 4! It's zero based!
Now you can happily store the string in some variable
string fourthThing = var.Split (',')[3];
Additional Information:
The Split method also has a overload that takes a char and a StringSplitOptions. If you do something like this:
var.Split (',', StringSplitOptions.RemoveEmptyEntries)
Empty entries will be automatically removed! How good!
More information: https://msdn.microsoft.com/en-us/library/system.string.split(v=vs.110).aspx

You can use string Split method
string data = "0,0,0.1987,22.13";
string value = data.Split(',')[3];

To pick up the last element, you can use Split function and Linq as below
string GetLastElement(string data) {
return data.Split(',').Last();
}

How to parse the numbers from the text and display it in textBox? c#

I have a string with the following text:
:0c4b7fcdffc38322555a9e35c22c9469:Nick:194176015020283762507:
How do I parse the final number? i.e.:
194176015020283762507

You should first use String.Split() to separate the string by the colon (':') separators. Then access the correct element.
var input = ":0c4b7fcdffc38322555a9e35c22c9469:Nick:194176015020283762507:";
var split = input.Split(':');
var final = split[3];
Note that by default, Split() keeps empty entries. You will have one at the beginning and end, because of the initial and ending colons. You could also use:
var split = input.Split(new[] {':'}, StringSplitOptions.RemoveEmptyEntries);
var final = split[2];
which, as the option implies, removes empty entries from the array. So your number would be at index 2 instead of 3.

string str = ":0c4b7fcdffc38322555a9e35c22c9469:Nick:194176015020283762507:";
string num = str.Split(':')[3];

var finalNumber = input.Split(new char[] { ':' }, StringSplitOptions.RemoveEmptyEntries)
.Last()
This code will split your input string into strings, separated by : (empty strings are removed from start and end of sequence). And last string is returned, which is your finalNumber.