C# Version Of SQL LIKE

C# Version Of SQL LIKE

In C#, you can use the string.Contains method to perform a similar operation as the SQL LIKE operator. The string.Contains method checks if a specific substring is present within a given string.

Here's an example of how to use string.Contains in C#:

using System; class Program { static void Main() { string text = "Hello, World!"; // Check if the string contains a specific substring if (text.Contains("Hello")) { Console.WriteLine("Substring 'Hello' is found."); } else { Console.WriteLine("Substring 'Hello' is not found."); } if (text.Contains("Universe")) { Console.WriteLine("Substring 'Universe' is found."); } else { Console.WriteLine("Substring 'Universe' is not found."); } } }

In this example, we use the string.Contains method to check if the text variable contains the substrings "Hello" and "Universe." As a result, it will output:

Substring 'Hello' is found. Substring 'Universe' is not found.

Keep in mind that string.Contains performs a case-sensitive search by default. If you want to perform a case-insensitive search, you can use the string.Contains method overload that accepts a StringComparison parameter:

if (text.Contains("hello", StringComparison.OrdinalIgnoreCase)) { Console.WriteLine("Substring 'hello' is found."); } else { Console.WriteLine("Substring 'hello' is not found."); }

In this case, it will output:

Substring 'hello' is found.

With string.Contains, you can easily search for substrings in a given string, similar to the SQL LIKE operator in SQL queries.

Examples

  1. "C# String.Contains() for SQL LIKE '%pattern%'"

    string input = "some text with pattern"; bool containsPattern = input.Contains("pattern");

    Description: Checks if the input string contains the specified pattern, similar to SQL LIKE '%pattern%'.

  2. "C# String.StartsWith() for SQL LIKE 'pattern%'"

    string input = "pattern at the beginning"; bool startsWithPattern = input.StartsWith("pattern");

    Description: Verifies if the input string starts with the specified pattern, equivalent to SQL LIKE 'pattern%'.

  3. "C# String.EndsWith() for SQL LIKE '%pattern'"

    string input = "ends with pattern"; bool endsWithPattern = input.EndsWith("pattern");

    Description: Checks if the input string ends with the specified pattern, resembling SQL LIKE '%pattern'.

  4. "C# String.Contains() case-insensitive for SQL LIKE '%pattern%'"

    string input = "Some text with Pattern"; bool containsPattern = input.IndexOf("pattern", StringComparison.OrdinalIgnoreCase) >= 0;

    Description: Performs a case-insensitive check for the pattern within the input string, similar to SQL LIKE '%pattern%'.

  5. "C# Regex.IsMatch() for SQL LIKE 'pattern%'"

    string input = "pattern at the beginning"; bool matchesPattern = Regex.IsMatch(input, "^pattern");

    Description: Uses a regular expression to check if the input string starts with the specified pattern, equivalent to SQL LIKE 'pattern%'.

  6. "C# Regex.IsMatch() for SQL LIKE '%pattern'"

    string input = "ends with pattern"; bool matchesPattern = Regex.IsMatch(input, "pattern$");

    Description: Utilizes a regular expression to determine if the input string ends with the specified pattern, resembling SQL LIKE '%pattern'.

  7. "C# String.Contains() with wildcard '*' for SQL LIKE 'pat%tern'"

    string input = "pat-tern"; bool containsPattern = input.Contains("pat*tern".Replace("*", ""));

    Description: Adapts String.Contains() to handle a wildcard '*' for patterns like SQL LIKE 'pat%tern'.

  8. "C# Regex.IsMatch() with wildcard '.' for SQL LIKE 'pat.tern'"

    string input = "patxtern"; bool matchesPattern = Regex.IsMatch(input, "pat.tern");

    Description: Uses a regular expression with a wildcard '.' to match any single character, similar to SQL LIKE 'pat.tern'.

  9. "C# String.Contains() with multiple patterns for SQL LIKE 'pattern1%pattern2%'"

    string input = "pattern1 in the middle pattern2"; bool containsPatterns = input.Contains("pattern1") && input.Contains("pattern2");

    Description: Checks if the input string contains multiple patterns, similar to SQL LIKE 'pattern1%pattern2%'.

  10. "C# Regex.IsMatch() for SQL LIKE with character range 'pat[ab]tern'"

    string input1 = "patatern"; string input2 = "patbtern"; bool matchesPattern1 = Regex.IsMatch(input1, "pat[ab]tern"); bool matchesPattern2 = Regex.IsMatch(input2, "pat[ab]tern");

    Description: Uses a character range '[ab]' in a regular expression to match either 'a' or 'b', resembling SQL LIKE 'pat[ab]tern'.

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