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    <p>Use zero-width matching assertions:</p> <pre><code> String str = "la$le\\$li$lo"; System.out.println(java.util.Arrays.toString( str.split("(?&lt;!\\\\)\\$") )); // prints "[la, le\$li, lo]" </code></pre> <p>The regex is essentially</p> <pre><code>(?&lt;!\\)\$ </code></pre> <p>It uses negative lookbehind to assert that there is not a preceding <code>\</code>.</p> <h3>See also</h3> <ul> <li><a href="http://www.regular-expressions.info/lookaround.html" rel="nofollow noreferrer">regular-expressions.info/Lookarounds</a></li> </ul> <hr> <h3>More examples of splitting on assertions</h3> <p>Simple sentence splitting, keeping punctuation marks:</p> <pre><code> String str = "Really?Wow!This.Is.Awesome!"; System.out.println(java.util.Arrays.toString( str.split("(?&lt;=[.!?])") )); // prints "[Really?, Wow!, This., Is., Awesome!]" </code></pre> <p>Splitting a long string into fixed-length parts, using <code>\G</code></p> <pre><code> String str = "012345678901234567890"; System.out.println(java.util.Arrays.toString( str.split("(?&lt;=\\G.{4})") )); // prints "[0123, 4567, 8901, 2345, 6789, 0]" </code></pre> <p>Using a lookbehind/lookahead combo:</p> <pre><code> String str = "HelloThereHowAreYou"; System.out.println(java.util.Arrays.toString( str.split("(?&lt;=[a-z])(?=[A-Z])") )); // prints "[Hello, There, How, Are, You]" </code></pre> <h3>Related questions</h3> <ul> <li><a href="https://stackoverflow.com/questions/2406633/can-you-use-zero-width-matching-regex-in-string-split">Can you use zero-width matching regex in String split?</a></li> <li><a href="https://stackoverflow.com/questions/2734977/backreferences-in-lookbehind">Backreferences in lookbehind</a></li> <li><a href="https://stackoverflow.com/questions/2559759/how-do-i-convert-camelcase-into-human-readable-names-in-java">How do I convert CamelCase into human-readable names in Java?</a></li> </ul>
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    1. COyou beat me by seconds =P
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    2. COAlso works with `"(?<=[^\\\\])\\$"`
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    3. CO@Fenris: the difference is that if `$` is the first character, my regex can still split on it, and yours can't, because it insists that there is a character preceding it (that is not a slash).
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