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Does it work? It strips the extension for all files terminated with: <br />
something + \ + any character + gz.<br />
<br />
Use these options for the whole regular expression «(?i)»<br />
&nbsp; &nbsp;&amp;Case insensitive «i»<br />
Match the backslash character «\\»<br />
Match any single character that is NOT a line break character (line feed, carriage return, next line, line separator, paragraph separator) «.»<br />
Match the character string “gz” literally (case insensitive) «gz»<br />
Assert position at the end of the string, or before the line break at the end of the string, if any (carriage return and line feed, next line, line separator, paragraph separator) «$»
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Does it work? It strips the extension for all files terminated with:
something + \ + any character + gz.

Use these options for the whole regular expression «(?i)»
   &Case insensitive «i»
Match the backslash character «\\»
Match any single character that is NOT a line break character (line feed, carriage return, next line, line separator, paragraph separator) «.»
Match the character string “gz” literally (case insensitive) «gz»
Assert position at the end of the string, or before the line break at the end of the string, if any (carriage return and line feed, next line, line separator, paragraph separator) «$»

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Thanks. &nbsp;mccarl -- You had the better answer. Dan -- Thanks for the input. It was helpful, but mccarl did point out an error.
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Thanks.  mccarl -- You had the better answer. Dan -- Thanks for the input. It was helpful, but mccarl did point out an error.

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Looks like Java was very late to the regex party and already used \ as an escape character in the literal strings: <a href="http://www.regular-expressions.info/java.html" rel="ugc">http://www.regular-expressions.info/java.html</a><br />
<br />
Makes for some funny looking expressions...
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Looks like Java was very late to the regex party and already used \ as an escape character in the literal strings: http://www.regular-expressions.info/java.html [http://www.regular-expressions.info/java.html]

Makes for some funny looking expressions...

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I have a File f, and the following code:<br />
String name = f.getName().replaceAll(&quot;(?<wbr />i)\\.gz$&quot;,<wbr /> &quot;&quot;);<br />
<br />
What exactly is being matched and replaced?
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I have a File f, and the following code:
String name = f.getName().replaceAll("(?i)\\.gz$", "");

What exactly is being matched and replaced?

Java Regular Expression

Java is a platform-independent, object-oriented programming language and run-time environment, designed to have as few implementation dependencies as possible such that developers can write one set of code across all platforms using libraries. Most devices will not run Java natively, and require a run-time component to be installed in order to execute a Java program.

Java

A regular expression ("regex") is a sequence of characters that define a search pattern, mainly for use in pattern matching with strings, or string matching, i.e. "find and replace"-like operations. Regular expression processors are found in several search engines, search and replace dialogs of several word processors and text editors, and in the command lines of text processing utilities, such as sed and AWK. Many programming languages provide regular expression capabilities, some built-in, for example Perl, JavaScript, Ruby, AWK, and Tcl, and others via a standard library, for example .NET languages, Java, Python and C++ (since C++11). Most other languages offer regular expressions via a library.