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
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