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    <p>The problem is: you accidentally swapped the use of the regexp pattern and the expression to check</p> <pre><code>String exp = "ABCD_123_abc"; String regExp = "([a-zA-Z]+)_([0-9]+)_([a-z]+)"; </code></pre> <p>Should be used </p> <pre><code>Pattern pattern = Pattern.compile(regExp); Matcher matcher = pattern.matcher(exp); </code></pre> <p>The <a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/util/regex/Pattern.html#compile%28java.lang.String%29">Pattern.compile(String regex)</a> function accepts the regular expression.</p> <p><strong>EDIT</strong></p> <p>I apologize, my first solution was truly something that must <strong>never ever, <em>never</em> ever</strong> be done: the names of the variables were contradictory to the meaning of their values... That means pain and tears, and getting hit by angry colleagues while being shouted at. And there is no valid defense to this <strong>crime</strong>...</p> <p><strong>EDIT2</strong> You can get the individual matched groups by the <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/regex/Matcher.html#group%28int%29">Matcher.group(int)</a> function:</p> <pre><code>String matchedStringpart matcher.group(2); </code></pre> <p>Notice: I used <code>2</code> as the argument:</p> <ul> <li><code>0</code> means the input sequence matched</li> <li><code>1</code> means the first group (<code>ABC</code> in this case)</li> <li>... and so on</li> </ul> <p>If you only need the <code>123</code> part, I'd rewrite the regex for clarity:</p> <pre><code>regExp = "[a-zA-Z]+_([0-9]+)_[a-z]+"; </code></pre> <p>However, in that case, the <code>group()</code> has to be called with <code>1</code>, as now the first (and only) matched group is the first one:</p> <pre><code>String matchedStringpart matcher.group(1); </code></pre>
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    1. COI think, actually, `Pattern.compile(regExp)` makes better sense, which would mean OP reversed the compile and matcher statements, but essentially it's the same bug.
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    2. COSolves it, but the names are now very misleading
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    3. CO@all True, Sometimes brains are quirky things :) I assumed that if the Strings have to be swapped, I can swap the handles to it (lazyness, this meant less characters to be changed) - somehow I completely ignored the semantics of the names of the variables. Which is not to be done at all times...
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