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POChecking strings for a strong enough password
 

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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/3131025/strong-password-regex">Strong password regex</a><br> <a href="https://stackoverflow.com/questions/5142103/need-regex-for-password-strength">Need RegEx for password strength?</a> </p> </blockquote> <p>I was just wondering what the best way to search a string for certain criteria (password strength to be specific) could be accomplished.</p> <p>So far I have a simple:</p> <pre><code>if(password.Length &lt;= 7) { errorMessage = "Your password must be at least 8 characters."; } </code></pre> <p>I would like to be able to check for capital letters, but I am not sure what the method or procedure is. I have tried Googling, searching the website: <a href="http://msdn.microsoft.com" rel="noreferrer">http://msdn.microsoft.com</a>, and searching the index of my C# book (C# Programming 3E, by Barbara Doyle), but I can't seem to find any.</p> <p>I know I could try this...:</p> <pre><code>foreach(char c in password) { if(c!='A' || c!='B' || c!='C' || c!='D' ..... || c!='Z') { errorMessage = "Your password must contain at least one capital letter"; } } </code></pre> <p>...But that would be extremely sloppy, and would have to be doubled to check for at least one lowercase letter. I am sure there is a better way to do this, or at least shorthand for the method I have shown above.</p> <p>Also, I may decide to check the password for special characters (seems easier to do in the example above than with upper and lower case letters, so I may just use that for special characters, should I decide to make them necessary). If there is an easy (or proper) way to do that, I would love to have that knowledge, as well.</p> <p>Anyway, thank you so much for any help anyone can give.</p>
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    1. COThis isn't an answer, but be sure you understand http://xkcd.com/936/ and http://xkcd.com/792/ And I also recommend reading http://www.codinghorror.com/blog/2010/12/the-dirty-truth-about-web-passwords.html and searching Jeff's site for other related articles. Then look at Regular Expressions for verifying the appropriate length/complexity.
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    2. COInstead of a series of `if...then` clauses, you'd probably want to run the password through a regular expression. Take a look at this [SO answer](http://stackoverflow.com/questions/3131025/strong-password-regex). I think it provides the Regular Expression that will help you.
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    3. CO@DarinDimitrov Hey, thanks for that, I didn't see that link, because I didn't know to search for regex (although, I guess it's kind of obvious). My apologies, and thnx for the link!
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