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Splitting a string into characters, but keeping some together [closed]

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I have this string: TF'E'
I want to split it to characters, but the '" character should join the character before it.
So it would look like this: T, F' and E'

You could use a regular expression to split the string at each position immediately before a new letter and an optional ':
var input = "TF'E'";
var output = Regex.Split(input, #"(?<!^)(?=\p{L}'?)");
output will now be a string array like ["T", "F'", "E'"]. The lookbehind (?<!^) ensure we never split at the start of the string, whereas the lookahead (?=\p{L}'?) describes one letter \p{L} followed by 0 or 1 '.

You can use a regex to capture "an uppercase character followed optionally by an apostrophe"
var mc = Regex.Matches(input, "(?<x>[A-Z]'?)");
foreach(Match m in mc)
Console.WriteLine(m.Groups["x"].Value);

If you don't like regex, you can use this method:
public static IEnumerable<string> Split(string input)
{
for(int i = 0; i < input.Length; i++)
{
if(i != (input.Length - 1) && input[i+1] == '\'')
{
yield return input[i].ToString() + input[i+1].ToString();
i++;
}
else
{
yield return input[i].ToString();
}
}
}
We loop through the input string. We check if there is a next character and if it is a '. If true, return the current character and the next character and increase the index by one. If false, just return the current character.
Online demo: https://dotnetfiddle.net/sPCftB

regex to remove digits, allow only lowercase letters, remove special characters [closed]

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Here is my code :
private void txtMot_KeyUp(object sender, KeyEventArgs e)
{
/* Clear message */
txtMessage.Clear();
Regex regex = new Regex(#"\d+");
Match match = regex.Match(txtMot.Text);
if (match.Success)
{
/* Text in red*/
txtMessage.Foreground = Brushes.Red;
/* Message text*/
txtMessage.Text = "Only letters";
}
}
I managed to remove all the digits.
I'm wondering now, how can I make it to :
Remove the digits.
Allow only lowercase letters.
Remove any kind of special characters(_+ù$é)
How can I do it please?

you can simply use the regex [a-z] and test with different set of data, as it accepts only the lowercase letters
public static void Main()
{
string test = "_+ù$é"; //change this to any set of test data
Regex regex = new Regex(#"[a-z]");
Match match = regex.Match(test);
if (match.Success)
{
Console.WriteLine("Matched");
}
else
Console.WriteLine("Not Matched");
}
dotNetFiddle
EDIT:
The above snippet would fail in a scenario where;
string test = "_+ù$é abc";
^ as this contains both the special letters and the lowercase, if you only want the lowercase letters to be accepted then;
replace this:
Regex regex = new Regex(#"[a-z]");
with this pattern:
Regex regex = new Regex(#"^([a-z]{1,25})$"); //this makes sure the string
// is only of lowercase
// letters and does not contain any digits
// or special chars
dotNetFiddle

For loop check if string only has 3 capital letters followed by 4 numbers [closed]

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I input a string that has to start with three capital letters and ending with four digits (like so: "SJL1036") the program is just supposed to check if my input follows that model.
if i were to input "Sjl1036" og "SJL103" it would output that it is a false statement.

Try this regular expression. 3 uppercase, 4 numbers.
^[A-Z]{3}[0-9]{4}$
For example:
var value = "FSK2526";
if (Regex.IsMatch(value, #"^[A-Z]{3}[0-9]{4}$")) {
// it matches
}

Although you could do it with for loop, but you could simplify it further with regex like:
Regex regex = new Regex(#"^[A-Z]{3}.*[0-9]{4}$");
Match match = regex.Match("SJL1036");
if (match.Success)
{
Console.WriteLine(match.Value);
}

If this is the requirement:
A string that has to start with three capital letters and ending with
four digits
Probably the most efficient approach is using string methods:
bool valid = input.Length >= 7
&& input.Remove(3).All(Char.IsUpper) // or input.Substring(0, 3)
&& input.Substring(input.Length - 4).All(Char.IsDigit);
If the actual requirement is "3 capital letters followed by 4 numbers"(so 7 characters) you just need to change input.Length >= 7 to input.Length == 7.

A non-Regex option, You can use a bit of LINQ like:
string str = "SJL1036";
if (str.Length == 7 &&
str.Take(3).All(char.IsUpper)
&& str.Skip(3).All(char.IsDigit))
{
Console.WriteLine("valid");
}
else
{
Console.WriteLine("invalid");
}

How can I return the index of the second word in a string that can have multiple white spaces followed by one word followed by multiple white spaces? [closed]

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String str =" vol ABCD C XYZ";
I want to return the index of "A"
Note: There are multiple white spaces before all words including the first.

This will get the index of A in your original example (String str =" vol ABCD C XYZ";):
int indexOfABCD = str.IndexOf(str.Trim()[str.Trim().IndexOf(' ')+1]);
If you have something like String str = " vol ABCD C XYZ"; where there are multiple spaces:
string secondword = str.Split(new[] { " " }, StringSplitOptions.RemoveEmptyEntries)[1];
int indexOfAinABCD = str.IndexOf(secondword.First());
If you want to get the indices of all the letters in the second word:
IEnumerable<int> fullindex = Enumerable.Range(indexOfAinABCD, secondword.Length);
EDIT:
This will fail if you have A anywhere else in the first word. You should get an exact match through Regex:
int indexOfAinABCD = Regex.Match(str, string.Format(#"\W{0}\W",secondword)).Index+1;
IEnumerable<int> fullindex = Enumerable.Range(indexOfAinABCD, secondword.Length);
So something like String str = " vABCDol ABCD C XYZ"; won't be an issue

How to find the capital substring of a string? [closed]

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I am trying to find the capitalized portion of a string, to then insert two characters that represent the Double Capital sign in the Braille language. My intention for doing this is to design a translator that can translate from regular text to Braille.
I'll give an example belo.
English String: My variable is of type IEnumerable.
Braille: ,My variable is of type ,,IE-numberable.
I also want the dash in IE-numerable to only break words that have upper and lower case, but not in front of punctuation marks, white spaces, numbers or other symbols.
Thanks a lot in advance for your answers.

I had never heard of a "Double Capital" sign, so I read up on it here. From what I can tell, this should suit your needs.
You can use this to find any sequence of two or more uppercase (majuscule) Latin letters or hyphens in your string:
var matches = Regex.Matches(input, "[A-Z-]{2,}");
You can use this to insert the double-capital sign:
var result = Regex.Replace(input, "[A-Z-]{2,}", ",,$0");
For example:
var input = "this is a TEST";
var result = Regex.Replace(input, "[A-Z-]{2,}", ",,$0"); // this is a ,,TEST
You can use this to hand single and double capitals:
var input = "McGRAW-HILL";
var result = Regex.Replace(input, "[A-Z-]([A-Z-]+)?",
m => (m.Groups[1].Success ? ",," : ",") + m.Value); // ,Mc,,GRAW-HILL

You can find them with a simple regex:
using System.Text.RegularExpressions;
// ..snip..
Regex r = new Regex("[A-Z]"); // This will capture only upper case characters
Match m = r.Match(input, 0);
The variable m of type System.Text.RegularExpressions.Match will contain a collection of captures. If only the first match matters, you can check its Index property directly.
Now you can insert the characters you want in that position, using String.Insert:
input = input.Insert(m.Index, doubleCapitalSign);

this code can solve your problema
string x = "abcdEFghijkl";
string capitalized = string.Empty;
for (int i = 0; i < x.Length; i++)
{
if (x[i].ToString() == x[i].ToString().ToUpper())
capitalized += x[i];
}

Have you tried using the method Char.IsUpper method
http://msdn.microsoft.com/en-us/library/9s91f3by.aspx
This is another similar question that uses that method to solve a similar problem
Get the Index of Upper Case letter from a String

If you just want to find the first index of an uppercase letter:
var firstUpperCharIndex = text // <-- a string
.Select((chr, index) => new { chr, index })
.FirstOrDefault(x => Char.IsUpper(x.chr));
if (firstUpperCharIndex != null)
{
text = text.Insert(firstUpperCharIndex.index, ",,");
}

Not sure if this is what you are going for?
var inputString = string.Empty; //Your input string here
var output = new StringBuilder();
foreach (var c in inputString.ToCharArray())
{
if (char.IsUpper(c))
{
output.AppendFormat("_{0}_", c);
}
else
{
output.Append(c);
}
}
This will loop through each character in the inputString if the characater is upper it inserts a _ before and after (replace that with your desired braille characters) otherwise appends the character to the output.