Learn how to locate and substitute every designated character instance, whether using C# or regex. Discover the process of converting code from Javascript to C#

Locate and substitute the 3rd instance of each character in a given string with H

For example: 74Mercedes1980 would become 74HerHedHs1H80

This task can be accomplished using C# or regex.

I have come across a Javascript script that achieves this, but I am looking to translate it into C#. Can you provide assistance?

Source found at here

str = str.replace(/((?:[^x]*x){2}[^x]*)x/g, '$1y');

let str = 'I amx nexver axt hoxme on Sxundxaxs';
let n = 3;
let ch = 'x';

let regex = new RegExp("((?:[^" +ch+ "]*" +ch+ "){" + (n-1) + "}[^" +ch+ "]*)" +ch, "g");

str = str.replace(regex, '$1y');

console.log(str);
//=> I amx nexver ayt hoxme on Sxundyaxs
javascriptc#.net

Answer №1

You have the ability to capture 2 non-whitespace characters using \S and match the 3rd non-whitespace character.

When replacing, utilize the captured group followed by the specific character you want in the replacement text.

If there is a need to include a space as well, a dot . can be used instead of \S

let str = '74Mercedes1980';
let n = 3;
let ch = 'H';
let regex = new RegExp("(\\S{" + (n - 1) + "})\\S", "g");
str = str.replace(regex, `$1${ch}`);
console.log(str);

This can also be achieved in C# as follows:

var str = "74Mercedes1980";
var n = 3;
var ch = 'H';
var regex = new Regex("(\\S{" + (n - 1) + "})\\S");
str = regex.Replace(str, "$1" + ch);
Console.WriteLine(str);

Output

74HerHedHs1H80

For a demonstration in C#, check out this C# demo

Answer №2

The example with predefined values translates to

var re = new Regex("((?:[^x]*x){2}[^x]*)x");
var result = re.Replace("I amx nexver axt hoxme on Sxundxaxs", m => m.Groups[1] + "y");

This can also be expressed as

var ch = 'x';
var n = 3;
var str = "I amx nexver axt hoxme on Sxundxaxs";
var re = new Regex("((?:[^" +ch+ "]*" +ch+ "){" + (n-1) + "}[^" +ch+ "]*)" +ch);
var result = re.Replace(str, m => m.Groups[1] + "y");
Console.WriteLine(result);

For a working demo, visit: https://dotnetfiddle.net/u8mJrn

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