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The basic expression requires at least 1 lower case, 1 upper case, 1 numeric, 1 non-word and no whitespace. <br /><br /> The format of the expression lends itself to being parameterised, thus in C# I have a method that returns a modified pattern based on passed in parameters e.g. <br /><br />return "^(?=(.*[a-z]){" + minLowerCase.ToString() + ",})"<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;+ "(?=(.*[\d]){" + minNumeric.ToString() + ",})"<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;... <br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;+ ".{" + minLength.ToString() + "," + maxLength.ToString() + "}$");<br /><br />Its then possible to set the password strength via configuration files which require strong passwords in production environments, but allow weaker passwords in development environments.