Remove filename extension in Java

Question

(Without including any external libraries.)

What\'s the most efficient way to remove the extension of a filename in Java, without assuming anything of the f

Answer 1

Regex for these things are "fast" enough but not efficient if compared to the simplest method that can be thought: scan the string from the end and truncate it at the first dot (not inclusive). In Java you could use lastIndexOf and substring to take only the part you are interested in. The initial dot should be considered as a special case and if the last occurrence of "." is at the beginning, the whole string should be returned.