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copied!<p>Something like this is simple enough:</p> <pre><code> String text = "CALDARI_STARSHIP_ENGINEERING"; text = text.replace("_", " "); StringBuilder out = new StringBuilder(); for (String s : text.split("\\b")) { if (!s.isEmpty()) { out.append(s.substring(0, 1) + s.substring(1).toLowerCase()); } } System.out.println("[" + out.toString() + "]"); // prints "[Caldari Starship Engineering]" </code></pre> <p>This <code>split</code> on the word boundary anchor.</p> <h3>See also</h3> <ul> <li><a href="http://www.regular-expressions.info/wordboundaries.html" rel="nofollow noreferrer">regular-expressions.info/Word boundary</a></li> </ul> <hr> <h3><code>Matcher</code> loop solution</h3> <p>If you don't mind using <code>StringBuffer</code>, you can also use <code>Matcher.appendReplacement/Tail</code> loop like this:</p> <pre><code> String text = "CALDARI_STARSHIP_ENGINEERING"; text = text.replace("_", " "); Matcher m = Pattern.compile("(?<=\\b\\w)\\w+").matcher(text); StringBuffer sb = new StringBuffer(); while (m.find()) { m.appendReplacement(sb, m.group().toLowerCase()); } m.appendTail(sb); System.out.println("[" + sb.toString() + "]"); // prints "[Caldari Starship Engineering]" </code></pre> <p>The regex uses assertion to match the "tail" part of a word, the portion that needs to be lowercased. It looks behind <code>(?<=...)</code> to see that there's a word boundary <code>\b</code> followed by a word character <code>\w</code>. Any remaining <code>\w+</code> would then need to be matched so it can be lowercased.</p> <h3>Related questions</h3> <ul> <li><a href="https://stackoverflow.com/questions/2770967/use-java-and-regex-to-convert-casing-in-a-string/">Use Java and RegEx to convert casing in a string</a> <ul> <li>Java regex does not support Perl preprocessing operations <code>\l</code> <code>\u</code>, <code>\L</code>, and <code>\U</code>. </li> </ul></li> <li><a href="https://stackoverflow.com/questions/2819933/java-split-is-eating-my-characters/">Java split is eating my characters.</a> <ul> <li>More examples of using assertions</li> </ul></li> <li><a href="https://stackoverflow.com/questions/355089/stringbuilder-and-stringbuffer-in-java">StringBuilder and StringBuffer in Java</a> <ul> <li>Unfortunately, <code>appendReplacement/Tail</code> only takes <code>StringBuffer</code></li> </ul></li> </ul>

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