URL regex C#
URL regular expressions can be used to verify if a string has a valid URL format as well as to extract an URL from a string.
URL regex that starts with HTTP or HTTPS
HTTP and HTTPS URLs that start with protocol can be validated using the following regular expression
new Regex("^https?:\\/\\/(?:www\\.)?[-a-zA-Z0-9@:%._\\+~#=]{1,256}\\.[a-zA-Z0-9()]{1,6}\\b(?:[-a-zA-Z0-9()@:%_\\+.~#?&\\/=]*)$")
Enter a text in the input above to see the result
Example code in C#:
using System.Text.RegularExpressions;
using System.Linq;
using System;
public class Program
{
public static void Main()
{
// Validate URL
Regex validateDateRegex = new Regex("^https?:\\/\\/(?:www\\.)?[-a-zA-Z0-9@:%._\\+~#=]{1,256}\\.[a-zA-Z0-9()]{1,6}\\b(?:[-a-zA-Z0-9()@:%_\\+.~#?&\\/=]*)$");
Console.WriteLine(validateDateRegex.IsMatch("")); // prints True
// Extract URL from a string
Regex extractDateRegex = new Regex("https?:\\/\\/(?:www\\.)?[-a-zA-Z0-9@:%._\\+~#=]{1,256}\\.[a-zA-Z0-9()]{1,6}\\b(?:[-a-zA-Z0-9()@:%_\\+.~#?&\\/=]*)");
string [] extracted = extractDateRegex.Matches("You can view more details at https://uibakery.io or just ping via email.")
.Cast<Match>()
.Select(m => m.Value)
.ToArray();
Console.WriteLine(String.Join(",", extracted)); // prints https://uibakery.io
}
}
URL regex that doesn’t start with HTTP or HTTPS
The regular expression to validate URL without protocol is very similar:
new Regex("^[-a-zA-Z0-9@:%._\\+~#=]{1,256}\\.[a-zA-Z0-9()]{1,6}\\b(?:[-a-zA-Z0-9()@:%_\\+.~#?&\\/=]*)$")
Enter a text in the input above to see the result
Example code in C#:
using System.Text.RegularExpressions;
using System.Linq;
using System;
public class Program
{
public static void Main()
{
// Validate URL without protocol
Regex validateDateRegex = new Regex("^[-a-zA-Z0-9@:%._\\+~#=]{1,256}\\.[a-zA-Z0-9()]{1,6}\\b(?:[-a-zA-Z0-9()@:%_\\+.~#?&\\/=]*)$");
Console.WriteLine(validateDateRegex.IsMatch("uibakery.io/contact")); // prints True
// Extract URL without protocol from a string
Regex extractDateRegex = new Regex("[-a-zA-Z0-9@:%._\\+~#=]{1,256}\\.[a-zA-Z0-9()]{1,6}\\b(?:[-a-zA-Z0-9()@:%_\\+.~#?&\\/=]*)");
string [] extracted = extractDateRegex.Matches("You can view more details at uibakery.io or just ping via email.")
.Cast<Match>()
.Select(m => m.Value)
.ToArray();
Console.WriteLine(String.Join(",", extracted)); // prints uibakery.io
}
}
Notes on URL validation
The above-mentioned regular expressions only cover the most commonly used types of URLs with domain names. If you have some more complex cases you might need a different solution.
