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    <p>This will check for two 5-digit numbers separated by a comma</p> <pre><code>^\d{5},\d{5}$ </code></pre> <p><img src="https://www.debuggex.com/i/2oOo4FRly_CRCGm_.png" alt="Regular expression visualization"></p> <p>But, you said <em>at least</em> two, so that means it needs to be a little more flexible to accommodate more. If the user enters <code>12345,12345,12345</code> it needs to be valid.</p> <pre><code>^\d{5}(?:,\d{5})+$ </code></pre> <p><img src="https://www.debuggex.com/i/e778dnUPFjb4PA2M.png" alt="Regular expression visualization"></p> <p>What if the user adds a space after the comma? Such as <code>12345, 12345</code>. This is perfectly valid, so let's make sure our validator allows that.</p> <pre><code>^\d{5}(?:,\s*\d{5})+$ </code></pre> <p><img src="https://www.debuggex.com/i/SvGUsdfHtpm7Hg9f.png" alt="Regular expression visualization"></p> <p>Oh, and zip codes can have an optional <code>-1234</code> ending on them, too (known as <a href="http://en.wikipedia.org/wiki/ZIP_code#ZIP.2B4" rel="nofollow noreferrer">ZIP+4</a>. Maybe you want something like this</p> <pre><code>^\d{5}(?:-\d{4})?(?:,\s*\d{5}(?:-\d{4})?)+$ </code></pre> <p><img src="https://www.debuggex.com/i/FgU204OOD99wGDXh.png" alt="Regular expression visualization"></p> <p>Now strings like this would be valid</p> <ul> <li>12345</li> <li>12345, 12345,12345</li> <li>12345, 12345-9999, 12345</li> </ul> <hr> <p><strong>As a bonus</strong>, let's say <code>12345, 12345</code> is invalid because it has the same zip code twice. Here's how we'd fix that</p> <pre><code>(?:(\d{5}),?)(?!.*\1) </code></pre> <p><img src="https://www.debuggex.com/i/M7Q8P_4Jt0usdLJg.png" alt="Regular expression visualization"></p> <p>And here's the ZIP+4 version</p> <pre><code>(?:(\d{5}(?:-\d{4})?),?)(?!.*\1(?!-)) </code></pre> <p><img src="https://www.debuggex.com/i/xChMFk5vKbjIxzeP.png" alt="Regular expression visualization"></p> <p>This one has a little added complexity because of possibility of (e.g.,) <code>12345, 12345-9999</code>. This is valid but because <code>12345</code> can appear more than once, it makes sure that a 5-digit zip code can't be invalidated by a unique 9-digit zip code.</p> <p><strong>Note</strong> these duplicate-checking regexps do not enforce the minimum of two unique zip codes. If you want to check for duplicates you'd need to combine the two.</p> <pre><code>var valid5DigitZipCodes = function(str) { if (! /^\d{5}(?:,\s*\d{5})+$/.test(str)) { alert("You need at least 2 zip codes"); return false; } else if (! /(?:(\d{5}),?)(?!.*\1)/.test(str)) { alert("You entered a duplicate zip code"); return false; } return true; }; </code></pre> <p>And here's the ZIP+4 variant if you want to support that</p> <pre><code>var valid9DigitZipCodes = function(str) { if (! /^\d{5}(?:-\d{4})?(?:,\s*\d{5}(?:-\d{4})?)+$/.test(str)) { alert("You need at least 2 zip codes"); return false; } else if (! /(?:(\d{5}(?:-\d{4})?),?)(?!.*\1(?!-)).test(str) { alert("You entered a duplicate zip code"); return false; } return true; }; </code></pre>
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