How to replace last dot in a string using a regular expression?

Question

I\'m trying to replace the last dot in a String using a regular expression.

Let\'s say I have the following String:

String string = \"hello.world.how         


        

Answer 1

One way would be:

string = string.replaceAll("^(.*)\\.(.*)$","$1!$2");

Alternatively you can use negative lookahead as:

string = string.replaceAll("\\.(?!.*\\.)","!");

Regex in Action