using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"# Adding password requirements are as easy as tacking on
# another (?=...) group.
^
(?=(?:[^a-z]*[a-z]){1}) # At least {1} lowercase 'a-z' letter
(?=(?:[^A-Z]*[A-Z]){2}) # At least {2} uppercase 'A-Z' letters
(?=(?:[^0-9]*[0-9]){3}) # At least {3} digits
(?=(?:[^\s]*[\s]){1}) # At least {1} whitespace
(?=(?:[^[:punct:]]*[[:punct:]]){1}) # At least {1} special char
(?=.{9}) # A minimum of 9 characters
";
string input = @"See 'unit tests' to see all matching/non-matching examples.
";
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