How to Remove Alternate/Extra Text (Text within Parenthesis) using VB.NET/C#

How to Remove Text within Brackets/ Braces using VB.NET/C#

Regular expressions come handy when we have this kind of requirement. Regex.Replace method can be used remove the unwanted text

        private static void RemoveTextWithinParens()

        {

            string pattern = @"\([^\(\)]+\)";

            string interesting_string = "SOMETHING (#2) and some more rhing (#3 inside braces)";

            Regex rgx = new Regex(pattern, RegexOptions.IgnoreCase);

            MatchCollection matches = rgx.Matches(interesting_string);

            string removed_String = rgx.Replace(interesting_string, "");

        }

How to validate password using C# (.NET)

How to check password using C# Regular Expressions / How to enforce strong password using C# .NET

One of the common methods to check and validate password is through regular expressions. The criteria for strong password is :

1. Password should be minimum eight characters in length
2. Password should contain atleast a digit and an alphabet
3. Password should contain a non-alphanumeric character

The code uses Regular Expressions and hence the following directive is used:

using System.Text.RegularExpressions; 

The code below checks for the length:

if (sPassword.Length < 8 )
                {
                    throw new Exception("Password should contain mimimum 8 chars");   
                }

the code below checks for presence of atleast one number

sPattern = "\\d";
                oReg = new Regex(sPattern, RegexOptions.IgnoreCase);
                if (oReg.IsMatch(sPassword) == false)
                {
                    throw new Exception("Password should contain mimimum one numeric character");
                }

the code below checks for presence of atleast one alphabet

sPattern = "\\w";
                oReg = new Regex(sPattern, RegexOptions.IgnoreCase);
                if (oReg.IsMatch(sPassword) == false)
                {
                    throw new Exception("Password should contain mimimum one alphabet character");
                }

the code below checks for presence of atleast one non-alphanumeric character

string sPattern;
                sPattern = "[^a-zA-Z0-9\n\r\t ]";
                Regex oReg = new Regex(sPattern, RegexOptions.IgnoreCase);
                if (oReg.IsMatch(sPassword) == false)
                {
                    throw new Exception("Password should contain mimimum one non-alphanumeric character");   
                }

Exceptions are raised and handled if the criteria is not matching