How do I trim a file extension from a String in Java?

What's the most efficient way to trim the suffix in Java, like this:

title part1.txt
title part2.html
=>
title part1
title part2

This is the sort of code that we shouldn't be doing ourselves. Use libraries for the mundane stuff, save your brain for the hard stuff.

In this case, I recommend using FilenameUtils.removeExtension() from Apache Commons IO

str.substring(0, str.lastIndexOf('.'))

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