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    <p>I'm going to step back to see the big picture and propose this solution to your problem instead:</p> <pre><code>System.out.println( "012345".replaceAll("(.)(.)", "$2$1") ); // "103254" </code></pre> <p>That is, given a <code>String s</code>, <code>s.replaceAll("(.)(.)", "$2$1"))</code> returns a new string where every adjacent pairs of characters in <code>s</code> are swapped. If <code>s</code> has odd length, then the last character remains unswapped. If the string can contain newline characters, then use <code>(?s)</code> embedded <a href="http://java.sun.com/javase/6/docs/api/java/util/regex/Pattern.html#DOTALL" rel="nofollow noreferrer"><code>Pattern.DOTALL</code></a>.</p> <p>Essentially the pattern is <code>..</code> (i.e. "any two characters"), but each <code>.</code> is surrounded by brackets to create capturing groups so the captured match can be used in the replacement.</p> <pre><code> MATCH: (.)(.) 1 2 REPLACE WITH: $2$1 </code></pre> <p>In Java regex, e.g. <code>$1</code> in the replacement string refers to what group 1 captured in the match.</p> <h3>References</h3> <ul> <li><a href="http://www.regular-expressions.info/dot.html" rel="nofollow noreferrer">regular-expressions.info/Dot Matches (Almost) Any Character</a> and <a href="http://www.regular-expressions.info/brackets.html" rel="nofollow noreferrer">Brackets for Grouping</a></li> <li><a href="http://java.sun.com/javase/6/docs/api/java/util/regex/Matcher.html#replaceAll%28java.lang.String%29" rel="nofollow noreferrer"><code>java.util.regex.Matcher.replaceAll</code></a></li> </ul> <hr> <h3>Variations</h3> <p>These are provided for more instructional values:</p> <pre><code> System.out.println( "abcdefg".replaceAll("(.)(.)", "$1[$2]") ); // "a[b]c[d]e[f]g" System.out.println( "&gt; Regular expressions: now you have two problems!" .replaceAll("(.)(.)", "$2$1") ); // " &gt;eRugal rxerpseisno:sn woy uoh va ewt orpboelsm!" System.out.println( "&gt; Regular expressions: now you have two problems!" .replaceAll("(\\w)(\\w)", "$2$1") ); // "&gt; eRugalr xerpseisnos: onw oyu ahev wto rpboelsm!" System.out.println( "Wow! Really?? That's awesome!!!" .replaceAll("(.)([!?]+)", "$1$1$1$2$2") ); // "Wowww!! Reallyyy???? That's awesomeee!!!!!!" </code></pre>
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    1. POHow do i put a value of an array into another one?
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