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    <p>You can try to use <code>split</code> method with <code>(?&lt;=\\G\\d+,\\d+,\\d+),</code> regex</p> <p>Demo</p> <pre><code>String data = "0,0,1,2,4,5,3,4,6"; String[] array = data.split("(?&lt;=\\G\\d+,\\d+,\\d+),"); //Magic :) // to reveal magic see explanation below answer for(String s : array){ System.out.println(s); } </code></pre> <p>output:</p> <pre><code>0,0,1 2,4,5 3,4,6 </code></pre> <p>Explanation</p> <ul> <li><code>\\d</code> means one digit, same as [0-9], like <code>0</code> or <code>3</code></li> <li><code>\\d+</code> means one or more digits like <code>1</code> or <code>23</code></li> <li><code>\\d+,</code> means one or more digits with comma after it, like <code>1,</code> or <code>234,</code> </li> <li><code>\\d+,\\d+,\\d+</code> will accept three numbers with commas between them like <code>12,3,456</code></li> <li><code>\\G</code> means last match, or if there is none (in case of first usage) start of the string</li> <li><code>(?&lt;=...),</code> is <a href="http://www.regular-expressions.info/lookaround.html#lookbehind" rel="nofollow noreferrer">positive look-behind</a> which will match comma <code>,</code> that has also some string described in <code>(?&lt;=...)</code> before it</li> <li><code>(?&lt;=\\G\\d+,\\d+,\\d+),</code> so will try to find comma that has three numbers before it, and these numbers have aether start of the string before it (like <code>^0,0,1</code> in your example) or previously matched comma, like <code>2,4,5</code> and <code>3,4,6</code>.</li> </ul> <hr> <p>Also in case you want to use other characters then digits you can also use other set of characters like</p> <ul> <li><code>\\w</code> which will match alphabetic characters, digits and <code>_</code></li> <li><code>\\S</code> everything that is not white space</li> <li><code>[^,]</code> everything that is not comma</li> <li>... and so on. More info in <a href="http://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html" rel="nofollow noreferrer">Pattern documentation</a></li> </ul> <hr> <p>By the way, this form will work with split on every 3rd, 5th, 7th, (and other odd numbers) comma, like <code>split("(?&lt;=\\G\\w+,\\w+,\\w+,\\w+,\\w+),")</code> will split on every 5th comma. </p> <p>To split on every 2nd, 4th, 6th, 8th (and rest of even numbers) comma you will need to replace <code>+</code> with <code>{1,maxLengthOfNumber}</code> like <code>split("(?&lt;=\\G\\w{1,3},\\w{1,3},\\w{1,3},\\w{1,3}),")</code> to split on every 4th comma when numbers can have max 3 digits (0, 00, 12, 000, 123, 412, 999).</p> <p>To split on every 2nd comma you can also use this regex <code>split("(?&lt;!\\G\\d+),")</code> based on my <a href="https://stackoverflow.com/a/16486373/1393766">previous answer</a></p>
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    1. COYou could also replace \\d+ with [^,]* to make it work with anything that's not a comma. So it would work with "a,b,c,f,g,h,x,y,z"
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    2. CO@agbinfo Yes, true, but since OP was asking about digits I used `\\d`. Anyway nice additional info, will include it to answer.
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