I would like to replace all ‘.’ and ‘ ‘ with a ‘_’ but

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Editorial Team

Asked: May 29, 20262026-05-29T18:45:48+00:00 2026-05-29T18:45:48+00:00

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…

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Editorial Team · Answer 1 · 2026-05-29T18:45:49+00:00

Editorial Team

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.

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