Regular Expression all characters except last one

Question

This is my string: 50.00.00..00.00

I want to match all . except the last one, so after a replace I end up with 50000000.00

Answer 1

\.(?=.*\.)

Matches a dot (\.), which there must be another dot following it ((?=.*\.)).

(This assumes the regex engine supports lookahead, e.g. PCRE, Python, etc.)