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  1. PO
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    <p>Actually this pattern matches all passwords with at least 3 characters (a digit, an upper case and a lower case in any order) without a length limit (except for the regex engine). All characters must be word characters (ie: from the class <code>\w</code>).</p> <p>The author intention was probably to match all passwords between 6 and 20 word characters with at least one digit, one upper case and one lower case, as the quantifier and the lookaheads suggest.</p> <p>In short this pattern is wrong, but probably aims what this classical password validation pattern does:</p> <pre><code>^(?=\w*[A-Z])(?=\w*[a-z])(?=\w*\d)\w{6,20}$ </code></pre> <p>or this one without all redundant <code>\w</code>:</p> <pre><code>^(?=.*[A-Z])(?=.*[a-z])(?=.*\d)\w{6,20}$ </code></pre> <p>Explanation: lookaheads are zero-width assertions, they don't consume characters, they are only tests. Consequence each of them are performed from the start of the string since they are anchored to the <code>^</code>. If each lookahead succeeds, then <code>\w{6,20}</code> is tested always from the start of the string to know if it contains only between 6 and 20 word characters. <code>$</code> means the end of the string.</p> <p>As said in comments, this pattern comes from the book <em>"Effortless E-commerce" first edition, by Larry Ullman</em>.</p> <p>Even if the author wrotes:</p> <blockquote> <p><em>"And, admittedly, even I often have to look up the proper syntax for patterns, but this one requires a high level of regular expression expertise."</em></p> </blockquote> <p>and even if I disagree with the second part of the sentence, I think this pattern is a simple typo. However I don't know if this one has been corrected in the second edition.</p>
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    1. PORegex for a password field validation
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    1. USCasimir et Hippolyte
    1. USCasimir et Hippolyte
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    1. COThis pattern will match any string that has at least 1 number, lower case letter and upper case letter, and contains only word characters `[a-zA-Z0-9_]`. It gets confusing because of use of `\w*` here, but the `{6,20}` actually has no effect, since it can be 6 to 20 of nothing (zero-width).
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      1. USPhill Sparks
 

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