Remove all dots except the first one from a string

Question

Given a string

\'1.2.3.4.5\'

I would like to get this output

\'1.2345\'

(In case there are no dots in the

Answer 1

Not sure what is supposed to happen if "." is the first character, I'd check for -1 in indexOf, also if you use substr once might as well use it twice.

if ( index != -1 ) {
    input = input.substr( 0, index + 1 ) + input.substr(index + 1).replace( /\./g, '' );
}