java - String: How to replace multiple possible characters with a single character?

Question

I would like to replace all '.' and ' ' with a '_'

but I don't like my code...

is there a more efficient way to do this than:

String new_s = s.toLowerCase().replaceAll(" ", "_").replaceAll(".","_");

?

toLowerCase() just there because I want it lower-cased as well...

Answer 1

String new_s = s.toLowerCase().replaceAll("[ .]", "_");

EDIT:

replaceAll is using regular expressions, and using . inside a character class [ ] just recognises a . rather than any character.