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2013-03-20T12:18:31.383
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2013-03-20T12:34:45.927
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<h2>Solution (partial)</h2> <p><strong>Please also check the next section. Don't just read the solution here.</strong></p> <p>Just modify your code a bit:</p> <pre class="lang-java prettyprint-override"><code>String test = "xyz_stringIAmLookingFor_zxy"; // Make the capturing group capture the text in between (\w*) // A capturing group is enclosed in (pattern), denoting the part of the // pattern whose text you want to get separately from the main match. // Note that there is also non-capturing group (?:pattern), whose text // you don't need to capture. Pattern p = Pattern.compile("_(\\w*)_"); Matcher m = p.matcher(test); while (m.find()) { // find next match // The text is in the capturing group numbered 1 // The numbering is by counting the number of opening // parentheses that makes up a capturing group, until // the group that you are interested in. String match = m.group(1); System.out.println(match); } </code></pre> <p><a href="http://docs.oracle.com/javase/7/docs/api/java/util/regex/Matcher.html#group%28%29" rel="nofollow"><code>Matcher.group()</code></a>, without any argument will return the text matched by the whole regex pattern. <a href="http://docs.oracle.com/javase/7/docs/api/java/util/regex/Matcher.html#group%28int%29" rel="nofollow"><code>Matcher.group(int group)</code></a> will return the text matched by capturing group with the specified group number.</p> <p>If you are using Java 7, you can make use of <em>named capturing group</em>, which makes the code slightly more readable. The string matched by the capturing group can be accessed with <a href="http://docs.oracle.com/javase/7/docs/api/java/util/regex/Matcher.html#group%28java.lang.String%29" rel="nofollow"><code>Matcher.group(String name)</code></a>.</p> <pre><code>String test = "xyz_stringIAmLookingFor_zxy"; // (?<name>pattern) is similar to (pattern), just that you attach // a name to it // specialText is not a really good name, please use a more meaningful // name in your actual code Pattern p = Pattern.compile("_(?<specialText>\\w*)_"); Matcher m = p.matcher(test); while (m.find()) { // find next match // Access the text captured by the named capturing group // using Matcher.group(String name) String match = m.group("specialText"); System.out.println(match); } </code></pre> <h2>Problem in pattern</h2> <p>Note that <code>\w</code> also matches <code>_</code>. The pattern you have is ambiguous, and I don't know what your expected output is for the cases where there are more than 2 <code>_</code> in the string. And do you want to allow underscore <code>_</code> to be part of the output?</p>
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1. POFind pattern in string with regex -> how to improve my solution
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1. CONo, there will be no "_" in the searched string. So your solution works perfectly. Thanks!
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