Verifying that a string contains only letters in C#

Verifying that a string contains only letters in C#

To verify that a string contains only letters in C#, you can use a regular expression. The regular expression should match any letter of the alphabet, both uppercase and lowercase. Here is an example using the Regex class in C#:

 using System.Text.RegularExpressions; public static bool ContainsOnlyLetters(string str) { return Regex.IsMatch(str, @"^[a-zA-Z]+$"); }

This method takes a string str as input and returns true if the string contains only letters, and false otherwise. The regular expression @"^[a-zA-Z]+$" matches the entire string (^ and $ are anchors that match the beginning and end of the string, respectively) and ensures that all characters in the string are letters ([a-zA-Z] matches any letter of the alphabet, both uppercase and lowercase). The + quantifier ensures that there is at least one letter in the string.

Examples

  1. C#: Check if String Contains Only Letters

    • Description: This query is about verifying whether a given string contains only letters (alphabetic characters) in C#.
    • Code:
      using System; using System.Linq; class Program { static void Main(string[] args) { string input = "SampleString123"; bool containsOnlyLetters = input.All(char.IsLetter); if (containsOnlyLetters) Console.WriteLine("String contains only letters."); else Console.WriteLine("String contains non-letter characters."); } }

  2. C# Regex to Verify Letter-Only String

    • Description: This query involves using regular expressions to check if a string contains only letters in C#.
    • Code:
      using System; using System.Text.RegularExpressions; class Program { static void Main(string[] args) { string input = "SampleString123"; bool containsOnlyLetters = Regex.IsMatch(input, "^[a-zA-Z]+$"); if (containsOnlyLetters) Console.WriteLine("String contains only letters."); else Console.WriteLine("String contains non-letter characters."); } }

  3. C#: Validate String for Alphabetic Characters

    • Description: This query is related to validating a string to ensure it contains only alphabetic characters in C#.
    • Code:
      using System; class Program { static void Main(string[] args) { string input = "SampleString123"; bool containsOnlyLetters = true; foreach (char c in input) { if (!char.IsLetter(c)) { containsOnlyLetters = false; break; } } if (containsOnlyLetters) Console.WriteLine("String contains only letters."); else Console.WriteLine("String contains non-letter characters."); } }

  4. C#: Check if String Consists of Alphabets Only Using LINQ

    • Description: This query involves checking if a string consists only of alphabets using LINQ in C#.
    • Code:
      using System; using System.Linq; class Program { static void Main(string[] args) { string input = "SampleString123"; bool containsOnlyLetters = input.All(c => char.IsLetter(c)); if (containsOnlyLetters) Console.WriteLine("String contains only letters."); else Console.WriteLine("String contains non-letter characters."); } }

  5. C# Method to Determine If String Contains Only Alphabet Characters

    • Description: This query is about implementing a method in C# to determine if a string contains only alphabet characters.
    • Code:
      using System; class Program { static bool ContainsOnlyLetters(string input) { foreach (char c in input) { if (!char.IsLetter(c)) return false; } return true; } static void Main(string[] args) { string input = "SampleString123"; bool containsOnlyLetters = ContainsOnlyLetters(input); if (containsOnlyLetters) Console.WriteLine("String contains only letters."); else Console.WriteLine("String contains non-letter characters."); } }

  6. C# Function to Check if String Contains Only Alphabetical Characters

    • Description: This query focuses on creating a function in C# to check if a string contains only alphabetical characters.
    • Code:
      using System; using System.Text.RegularExpressions; class Program { static bool ContainsOnlyLetters(string input) { return Regex.IsMatch(input, @"^[a-zA-Z]+$"); } static void Main(string[] args) { string input = "SampleString123"; bool containsOnlyLetters = ContainsOnlyLetters(input); if (containsOnlyLetters) Console.WriteLine("String contains only letters."); else Console.WriteLine("String contains non-letter characters."); } }

  7. C# Code to Validate String for Alphabetic Content

    • Description: This query involves validating a string to ensure it contains only alphabetic characters in C#.
    • Code:
      using System; class Program { static bool ValidateAlphabeticString(string input) { foreach (char c in input) { if (!char.IsLetter(c)) return false; } return true; } static void Main(string[] args) { string input = "SampleString123"; bool containsOnlyLetters = ValidateAlphabeticString(input); if (containsOnlyLetters) Console.WriteLine("String contains only letters."); else Console.WriteLine("String contains non-letter characters."); } }

  8. C# Program to Check if String Contains Only Alphabets

    • Description: This query involves writing a C# program to check if a given string contains only alphabets.
    • Code:
      using System; class Program { static void Main(string[] args) { string input = "SampleString123"; bool containsOnlyLetters = true; foreach (char c in input) { if (!char.IsLetter(c)) { containsOnlyLetters = false; break; } } if (containsOnlyLetters) Console.WriteLine("String contains only letters."); else Console.WriteLine("String contains non-letter characters."); } }

  9. C# Code to Verify If String Contains Alphabets Only

    • Description: This query involves writing C# code to verify if a string contains alphabets only.
    • Code:
      using System; class Program { static void Main(string[] args) { string input = "SampleString123"; bool containsOnlyLetters = true; foreach (char c in input) { if (!char.IsLetter(c)) { containsOnlyLetters = false; break; } } if (containsOnlyLetters) Console.WriteLine("String contains only letters."); else Console.WriteLine("String contains non-letter characters."); } }

  10. C# Code to Determine if String Contains Only Letters Using Regular Expressions

    • Description: This query involves using regular expressions in C# to determine if a string contains only letters.
    • Code:
      using System; using System.Text.RegularExpressions; class Program { static void Main(string[] args) { string input = "SampleString123"; bool containsOnlyLetters = Regex.IsMatch(input, "^[a-zA-Z]+$"); if (containsOnlyLetters) Console.WriteLine("String contains only letters."); else Console.WriteLine("String contains non-letter characters."); } }

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