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How can i replace characters in a string using c#? [closed]

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I have a string
"This is a test string for testing in dotnet4.8 (.net)" 53 chars
The requirement is that if the length of the string is greater than 40 characters
then to replace characters with "" starting from the (.net) moving to the left until the total chars is 40 , so i will end up with
"This is a test string for testing (.net)"
and it doesnt matter if the word is cut off , cause there could be scneario where the string is different but they will always end in (.net)

If I understood you right, you want the actual text to be 34 letters long, so when adding your "(.net)" ends up being 40.
so I guess something in the realms of:
public string Shorten(string s)
{
if(s.Length > 40)
return s.Substring(0,34) + "(.net)";
else
return s;
}

Try this:
const int maxLength = 40;
const string suffix = "(.net)";
var text = "This is a test string for testing in dotnet4.8 (.net)";
var exceed = text.Length - maxLength;
if (exceed > 0)
{
text = text.Substring(0, text.Length - exceed - suffix.Length) + suffix;
}

You could do this with Regex:
var input = "This is a test string for testing in dotnet4.8 (.net)";
var match = Regex.Match(input, #"^(.{0,34}).*?\(\.net\)$");
var result = $"{match.Groups[1].Value}(.net)";
That gives This is a test string for testing (.net).

Extract substring from the first letter [closed]

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I need to extract substring from string but starting with the first letter
example :
string s1 = "12 x 13 ABC 12# 15.8" substring = ABC 12# 15.8
string s2 = "25 x 32 FER #23.8" substring = FER #23.8
I tried the index of for the letter A or F but it didn't work
thanks

This should work (in case you use a non-letter character instead of x)
string SubstringThis(string input)
{
return new string(input.SkipWhile(c => !char.IsLetter(c)).ToArray());
}

Simple utility function:
string SubstringFromFirstLetter(string s)
{
for (int i=0; i < s.Length; ++i)
{
if (char.IsLetter(s[i]))
{
return s.Substring(i);
}
}
return "";
}
Keep in mind that x is a letter. Do you want it to match only capitalized letters?

public static string GetSubstringStartingWithFirstAlphaCharacter(this string toEvaluate)
{
const string pattern = "([a-zA-Z])(.+)";
var regex = new Regex(pattern);
return regex.Match(toEvaluate).Value;
}

C# - split string [closed]

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I have some problems with split and check string.
I need to split string, replace halfs and check is this the same as the second string.
example: first string = tokyo second string = koyto
soo... S = a+b = b+a
S - a = b and S - b = a
a and b is part of one string (S) and may have different long in this case a = to and b = koy
first I need to check string length - is the are different - then write Error - it's easy
the I thought that I can compare strings in ASCII (case sensitivity is not important) and it' could be ok but...
I can create string tooky which have got the same size in ASCII but is not created from split and invert parts of first string...
any ideas?
static void Main(string[] args)
{
string S = "tokyo";
string T = "kyoto";
if (S.Length == T.Length)
{
split string ?
}
else
Console.WriteLine("This two words are different. No result found.");
Console.Read();
}

I would suggest doing the comparisons with strings. You can use the String.ToLower() method to convert them both to lowercase for comparison.
I am not exactly sure what problem you are trying to solve is, but from what I understand you are trying to check if string S can be split into two substrings that can be rearranged to make string T.
To check this you will want something similar to the following
for (int i = 0; i < S.length; i++) {
string back = S.substring(i);
string front = S.substring(0,i);
if (T.equals(back + front))
result = true;
}
Hope this helps

If you want to compare equality of two collections you should consider using LINQ:
static void Main(string[] args)
{
string S = "tokyo";
string T = "kyoto";
if (S.Length == T.Length)
{
if (S.Intersect(T).Any())
{
Console.WriteLine("The Contents are the same");
Console.Read();
}
}
else
Console.WriteLine("This two words are diferent. No result found.");
Console.Read();
}

C# read only part of whole string [closed]

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I have a string which has a following format:
"####/xxxxx"
The text before the "/" is always an integer and I need to read it. How do I get only the integer part of this string (before the "/")?
Thank you for your help.

You can split the string on / and then use int.TryParse on the first element of array to see if it is an integer like:
string str = "1234/xxxxx";
string[] array = str.Split(new []{'/'}, StringSplitOptions.RemoveEmptyEntries);
int number = 0;
if (str.Length == 2 && int.TryParse(array[0], out number))
{
//parsing successful.
}
else
{
//invalid number / string
}
Console.WriteLine(number);

Use IndexOf and Substring:
int indexOfSlash = text.IndexOf('/');
string beforeSlash = null;
int numBeforeSlash = int.MinValue;
if(indexOfSlash >= 0)
{
beforeSlash = text.Substring(0, indexOfSlash);
if(int.TryParse(beforeSlash, out numBeforeSlash))
{
// numBeforeSlash contains the real number
}
}

Another alternative: use a regular expression:
var re = new System.Text.RegularExpression(#"^(\d+)/", RegexOptions.Compiled);
// ideally make re a static member so it only has to be compiled once
var m = re.Match(text);
if (m.IsMatch) {
var beforeSlash = Integer.Parse(re.Groups[0].Value);
}

Moving 7+-letter words to file [closed]

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How can I move all words of seven letters or more in one string to another?
I know that I need a foreach loop to go through each character, and some sort of way of seeing whether the next character is blank while using a counter; then, if the next char is blank, see whether the counter is greater than or equal to seven, then move what was just there to a new string, then into a file.

You can use LINQ's Where method:
string strBigText = Console.ReadLine();
IEnumerable<string> words = strBigText.Split(" ").Where(o => o.Length >= 7);
This is going to split your text at every space, creating an array of strings, then retrieve only the elements (strings) that have a length greater than or equal to 7.

You could use string.split
string[] array = yourString.split(' ');
list<string> longStrings = new list<string>();
for(int i = 0; i < array.length; i++){
if(array[i].length >= 7){
longStrings.add(array[i]);
}
}
Something like that.

I would recommend RegExp for this (http://www.regular-expressions.info/).
At the top of your code, say:
using System.Text.RegularExpressions;
Then, in your routine, just go:
string input = textbox1.Text; // or wherever else you get your string from
MatchCollection matches = new Regex(#"(^|\b)\w{7}\w*(\b|$)").Matches(input);
string[] results = new string[matches.Count];
for (int i = 0; i != matches.Count; i++)
results[i] = matches[i];
//Now results will be an array of the 7-letter words.