using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @" ^ # anchors the expression to the beginning
(?=[^a-z]*[a-z]) # not lowercase, followed by lowercase
(?=[^A-Z]*[A-Z]) # not UPPERCASE, followed by UPPERCASE
(?=\D*\d) # not a digit, followed by a digit
.{8,} # at least 8 characters long
$ # anchor the expression to the end
";
string input = @"strong?
WeaK1234
";
RegexOptions options = RegexOptions.Multiline | RegexOptions.IgnorePatternWhitespace;
foreach (Match m in Regex.Matches(input, pattern, options))
{
Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index);
}
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx