C#: Possible Palindromes from string of characters
C# Sharp Regular Expression: Exercise-3 with Solution
From Wikipedia
A palindrome is a word, number, phrase, or other sequence of characters which reads the same backward as forward, such as madam or racecar.
Write a C# Sharp program to check whether a given string of characters can be transformed into a palindrome. Return true otherwise false.
Sample Data:
("amamd") -> True
("pamamd") -> False
("ferre") -> True
Sample Solution-1:
C# Sharp Code:
using System;
using System.Text.RegularExpressions;
using System.Linq;
namespace exercises
{
class Program
{
static void Main(string[] args)
{
string text = "amamd";
Console.WriteLine("Original string: " + text);
Console.WriteLine("Check the said string of characters can be transformed into a palindrome? " + test(text));
text = "pamamd";
Console.WriteLine("\nOriginal string: " + text);
Console.WriteLine("Check the said string of characters can be transformed into a palindrome? " + test(text));
text = "ferre";
Console.WriteLine("\nOriginal string: " + text);
Console.WriteLine("Check the said string of characters can be transformed into a palindrome? " + test(text));
}
public static bool test(string text)
{
bool result = Regex.Replace(string.Concat(text.OrderBy(x => x)),@"([a-z])\1{1}",string.Empty).Length <= 1;
return result;
}
}
}
Sample Output:
Original string: amamd Check the said string of characters can be transformed into a palindrome? True Original string: pamamd Check the said string of characters can be transformed into a palindrome? False Original string: ferre Check the said string of characters can be transformed into a palindrome? True
Flowchart:

Sample Solution-2:
C# Sharp Code:
using System;
using System.Text.RegularExpressions;
using System.Linq;
namespace exercises
{
class Program
{
static void Main(string[] args)
{
string text = "amamd";
Console.WriteLine("Original string: " + text);
Console.WriteLine("Check the said string of characters can be transformed into a palindrome? " + test(text));
text = "pamamd";
Console.WriteLine("\nOriginal string: " + text);
Console.WriteLine("Check the said string of characters can be transformed into a palindrome? " + test(text));
text = "ferre";
Console.WriteLine("\nOriginal string: " + text);
Console.WriteLine("Check the said string of characters can be transformed into a palindrome? " + test(text));
}
public static bool test(string text)
{
text = string.Concat(text.OrderBy(c => c));
bool result = Regex.Replace(text, @"(.)\1", "").Length <= 1;
return result;
}
}
}
Sample Output:
Original string: amamd Check the said string of characters can be transformed into a palindrome? True Original string: pamamd Check the said string of characters can be transformed into a palindrome? False Original string: ferre Check the said string of characters can be transformed into a palindrome? True
Flowchart:

C# Sharp Code Editor:
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Previous C# Sharp Exercise: Calculate the average word length in a string.
Next C# Sharp Exercise: Validate a password.
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