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    <p><strong>Short answer</strong></p> <p>Your uid does not begin with a 'p'. All rules are checking that it begins with 'p'.</p> <p><strong>Long answer</strong></p> <pre><code>$match1 = preg_match('/^p[a-z\d][a-z\d][1-6][a-z]\d{2}e$/',$uid); </code></pre> <p>This is checking for something of the format: the letter p, lowercase letter, 1 digit number, lowercase letter, 1 digit number, number from 1 to 6, lowercase letter, number (1 or 2 digits), the letter e</p> <pre><code>$match2 = preg_match('/^p[a-z\d][a-z\d]school$/',$uid); </code></pre> <p>This is checking for something of the format: the letter p, lowercase letter, 1 digit number, lowercase letter, 1 digit number, the word 'school'</p> <pre><code>$match3 = preg_match('/^p[a-z\d][a-z\d]master$/',$uid); </code></pre> <p>This is checking for something of the format: the letter p, lowercase letter, 1 digit number, lowercase letter, 1 digit number, the word 'master'</p> <pre><code>$match4 = preg_match('/^p[a-z\d][a-z\d]ee01$/',$uid); </code></pre> <p>This is checking for something of the format: the letter p, lowercase letter, 1 digit number, lowercase letter, 1 digit number, the string 'ee01'</p> <p><strong>EDIT</strong></p> <p>If you wish to add 'c' to the allowed characters at the start of the matching, you can, for example do:</p> <pre><code>$match1 = preg_match('/^[cp][a-z\d][a-z\d][1-6][a-z]\d{2}e$/',$uid); </code></pre> <p><code>[cp]</code> instead of <code>p</code> checks for EITHER c or p as the first letter.</p>
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