[RESOLVED] Replace characters in a string

[tranquil]

Hello, this should be an easy question.

I have a string in which i want to replace a specific sequence of three final characters ("123") with a static character ("5"). For example, the string "hello123" needs to be "hello5", or "goodbye123" needs to be "goodbye5".

I know charAt can index one character, then a subString method can replace that character with something else, but how can three characters be repaced with one?

Many thanks.

[Fang]

var str = "goodbye123".replace(/\d+$/, "5");

[tranquil]

Thanks for the reponse Fang.

Wouldn't that replace any 3 digit combination with a "5"? If there is a string "goodbye987" I don't want to change it.

I only want the three end characters replaced if they are "123".

[Fang]

var str = "goodbye123".replace(/123$/, "5");

[tranquil]

That worked great. Thanks!