Replace middle letters with uppercase

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There is the following code, it has a function that finds the letters in word in its middle (1 or 2 characters) and makes them capital, and then outputs.

using System;

public class Program
    public static void Main()

    public static String test(string value) {
        return value.Length % 2 == 0 
            ? value.Substring(value.Length / 2 - 1, 2).ToUpper()
            : value.Substring(value.Length / 2, 1).ToUpper();

Tell me, please, how do I make it so that the word was completely derived, but the letters from the middle were completely replaced by capital letters?

It is necessary that it be so:


Something like this? Not the cleanest of ways.

public static string test(string value)
    if(string.IsNullOrEmpty(value)) return value;
    var array = value.ToCharArray();
    if (value.Length % 2 == 0)
        array[value.Length / 2 - 1] = Char.ToUpper(array[value.Length / 2 - 1]);
        array[value.Length / 2] = Char.ToUpper(array[value.Length / 2]);
        array[value.Length / 2] = Char.ToUpper(value[value.Length / 2]);
    return new string(array);

notepad++ regex for replacing Capital/uppercase letter in the middle , Yes, you can do it in Notepad++:. Find what: ([a-z]+[A-Z]+\w*); replace to: \L\1; make sure "match case" and "regular expression" are checked. This will look for� Letter case (or just case) is the distinction between the letters that are in larger upper case (also uppercase, capital letters, capitals, caps, large letters, or more formally majuscule) and smaller lower case (also lowercase, small letters, or more formally minuscule) in the written representation of certain languages.

You can do the transformation with the LINQ Select overload that works on pairs element-index.

public string MiddleLettersToUpper(string s)
    IEnumerable<char> transformed;
    if (s.Length % 2 == 0)
        transformed = s.Select((c, i) => 
            i == s.Length / 2 || i == s.Length / 2 - 1 ? char.ToUpper(c) : c);
        transformed = s.Select((c, i) => 
            i == s.Length / 2 ? char.ToUpper(c) : c);

    return string.Concat(transformed);

It's pretty performant, because string.Concat uses a StringBuilder underneath, so you only do one pass through the string and allocate one string for the result.

DISCLAIMER: This code doesn't care about the culture when using ToUpper, so it's not suitable for production (there's also no argument validation, but that's obvious).

Find and Replace upper case, Hi community, I would like to use the Find and Replace function to substitute a number of words which are in all caps, normal style, by a font in� Definition and Usage. The toUpperCase() method converts a string to uppercase letters. Note: The toUpperCase() method does not change the original string. Tip: Use the toLowerCase() method to convert a string to lowercase letters.

You can do it with regular expression:

    public static string test(string value)
        value = value ?? string.Empty;
        int half = value.Length % 2 == 0 ? (value.Length / 2) - 1: (value.Length / 2);
        Regex r = new Regex("(?<=^.{"+ half + "})[a-zA-Z]{1,2}(?=.{"+ half + "}$)");
        var match = r.Match(value);
        if (match != null)
            var result = r.Replace(value, match.ToString().ToUpper());
            return result;
        return value;

First we found the half count of letters (the count of letter in the bigging and the end not to uppaer)

Regular expression explains:

find start of a line (^) + any charecter (.) half count ({half}) but don't take them (Positive precedes Lookahead ?<=)

then find one or two charecters ({1,2}) in abc ([a-zA-Z]) - this is the match

and on the end find any charecter (.) half count ({half}) + end of a line ($) but again don't take them (Positive follows Lookahead ?=).

You can test this regex here : regex101

REGEX - Uppercase words in the middle of the sentence, Is there a regex / replace to make uppercase words in the middle of the sentence for lower case? (Yes, I could pass everything to Lower) but it has a however in� Then, click the “Change Case” button on the Home tab. Select the desired type of capitalization from the drop-down menu. The following types of capitalization are available: Sentence case: Capitalizes the first letter of the first word in a sentence. lowercase: Makes every letter lowercase. UPPERCASE: Makes every letter UPPERCASE.

Python Strings: Replace, Join, Split, Reverse, Uppercase & Lowercase, Python string can be created simply by enclosing characters in the double quote. For example: var = "Hello World!" In this tutorial, we will learn -. The short answer is: use the Python upper() function to convert a string to an uppercase character. Make each letter of a string to uppercase and create a new string with all character in uppercase. The uppercase makes all the letters in a capital case format. Somewhere in your programming, you may want to get uppercase letters in the output.

7. Strings — How to Think Like a Computer Scientist: Learning with , The len function returns the number of characters in a string: would use with a dictionary, except that all the uppercase letters come before all the lowercase letters. Strings are immutable, which means you can't change an existing string . In the menu bar, on the Home tab, click the Change Case icon, which has an uppercase 'A' and lowercase 'a.' Select the appropriate option from the list of values. For example, if you want to change to all uppercase letters, select the UPPERCASE option. If you want to change to all lowercase letters, select the lowercase option.

Program to Replace Lower-Case Characters with Upper-Case and , Program to Replace Lower-Case Characters with Upper-Case and Vice Versa on fibonacci, factorial, prime, armstrong, swap, reverse, search, sort, stack, queue,� Converting text between uppercase and lowercase can be very tedious, especially when you want to avoid inadvertent misspellings. Fortunately, Linux provides a handful of commands that can make the

  • Watch out for dividing by 0. Currently empty string will throw exception.
  • This works, but note that it performs two allocations, first in ToCharArray, then in new string.
  • @V0ldek String builder is not always faster it has been pointed out recently to me. Nor that more memory efficient for small strings. ->…. Also check this ->…
  • @panoskarajohn It does put less pressure on the garbage collector, but it only comes in play if this code is on a hot path. Optimisation should always come as a result of profiling an issue, so I'm just pointing out that there's room for improvement, if it's needed. You'd probably get the most efficiency out of the new string.Create that takes a SpanAction.
  • Thanks for the answer.