using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^
(?=[^a-z\n]*[a-z]) # ensure one lower case letter
(?=[^A-Z\n]*[A-Z]) # ensure one upper case letter
(?=[^\d\n]*\d) # ensure a digit
(?=[^!@?\n]*[!@?]) # special chars
.{10,} # at least 10 characters long
$";
string input = @"1234567890
AAAAAAAAAA
ABCDEFG123@a
aaaaa
@@@@@
abdgdgdh45FG@";
RegexOptions options = RegexOptions.IgnorePatternWhitespace | RegexOptions.Multiline;
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