Replacing illegal character in fileName

Question

In Java, I've a File-Name-String. There I want to replace all illegal Characters with '_', but not a-z, 0-9, -,. and _

I tried following code: But this did not worked!

myString = myString.replaceAll("[\\W][^\\.][^-][^_]", "_"); 

Answer 1

You need to replace everything but [a-zA-Z0-9.-]. The ^ within the brackets stands for "NOT".

myString = myString.replaceAll("[^a-zA-Z0-9\\.\\-]", "_"); 

Answer 2

If you are looking for options on windows platform then you can try below solution to make use of all valid characters other than "\/:*?"<>|" in file name.

fileName = fileName.replaceAll("[\\\\/:*?\"<>|]", "_");