how to trim specific characters off of Strings on Java

Question

I'd like to trim any single trailing . or -. I tried doing this by doing something like "f-o.o.".replaceFirst("^(\\.+)[-|.]$", "$0"). The expected string is f-o.o but I'm getting f-o.o.. Thank you.

This might answer your question: https://stackoverflow.com/questions/25691415/java-trim-leading-or-trailing-characters-from-a-string — R.Groote, Feb 28 '20 at 06:46

score 2 · Accepted Answer · answered Feb 28 '20 at 07:00

Your expression has two mistakes:

you put a slash in front of a dot, making it match a literal dot, not just any character
you put | into a character class, so your expression would remove not just . or - at the end of the string, but also |.

Use "f-o.o.".replaceFirst("[-.]$", "")

how to trim specific characters off of Strings on Java

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