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    <p>We have the following regex: <code>/^(\w*(?=\w*\d)(?=\w*[a-z])(?=\w*[A-Z])\w*){6,20}$/</code></p> <ol> <li><p>The first and last <code>/</code> are the delimiters.</p></li> <li><p><code>^</code> -> The start, <code>$</code> -> The end</p> <p>Which means if input is <code>abc</code> and your regex is <code>/^bc$/</code>, it won't get matched since bc is not at the beginning.</p></li> <li><p>Now we have <code>(\w*(?=\w*\d)(?=\w*[a-z])(?=\w*[A-Z])\w*){6,20}</code></p> <p>The <code>{6,20}</code> is the quantifier part, which means 6 up to 20 times.</p></li> <li><p>Let's break the regex further: <code>\w*(?=\w*\d)(?=\w*[a-z])(?=\w*[A-Z])\w*</code></p> <p>Let's provide some equivalents:</p> <ol> <li><code>\w</code> => [a-zA-Z0-9_]</li> <li><code>\d</code> => [0-9]</li> <li><code>*</code> => zero or more times</li> <li><p><code>(?=)</code> Is a lookahead assertion. Example <code>/a(?=b)/</code> this will match any "a" followed by "b"</p></li> <li><p>The purpose of those lookaheads:</p> <ul> <li><code>(?=\w*\d)</code> => check if there is a digit</li> <li><code>(?=\w*[a-z])</code> => check if there is a lowercase letter</li> <li><code>(?=\w*[A-Z])</code> => check if there is a uppercase letter</li> <li>Let's take <code>(?=\w*\d)</code>: The <code>\w*</code> is just there as a "workaround" in case there is [a-zA-Z0-9_]* before a digit</li> </ul></li> </ol></li> </ol> <p>In the end, this regex just makes sure that the input:</p> <ol> <li>is 6 to 20 characters long</li> <li>that there is minimal: 1 lowercase, 1 uppercase and 1 digit</li> <li>that the allowed characters are letters (upper and lowercase (a-z,A-Z)), digits and underscore.</li> </ol> <p>Three interesting sites <a href="http://www.regexper.com/" rel="nofollow noreferrer">www.regexper.com</a>, <a href="http://www.regular-expressions.info/" rel="nofollow noreferrer">www.regular-expressions.info</a> and <a href="http://www.regex101.com" rel="nofollow noreferrer">www.regex101.com</a>.</p> <p><strong>Note:</strong> Don't restrict passwords, you have to hash them anyway. Take a look <a href="https://stackoverflow.com/q/401656">here</a> or check the other questions on SO.</p>
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    1. CO`{6,20}` means 6 up to 20 **times** (not characters), and in this pattern has little effect since the group it applies to can be zero-width.
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    2. CO@PhillSparks Thanks for pointing that out :)
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    3. COThanks @HamZaDzCyberDeV . you have been a very great help and thank you for being kind in taking time to answer my problem. :) thanks for the point Phil.
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