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

let str = "12.1223....1322311..";

let finStr = str.replace(/(\d*.)(.*)/, '$1') + str.replace(/(\d*.)(.*)/, '$2').replace(/\./g,'');

console.log(finStr)

Answer 2

It would be a lot easier with reg exp if browsers supported look behinds.

One way with a regular expression:

function process( str ) {
    return str.replace( /^([^.]*\.)(.*)$/, function ( a, b, c ) { 
        return b + c.replace( /\./g, '' );
    });
}

Answer 3

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, '' );
}

Answer 4

Based on @Tadek's answer above. This function takes other locales into consideration.

---

For example, some locales will use a comma for the decimal separator and a period for the thousand separator (e.g. -451.161,432e-12).

First we convert anything other than 1) numbers; 2) negative sign; 3) exponent sign into a period ("-451.161.432e-12").

Next we split by period (["-451", "161", "432e-12"]) and pop out the right-most value ("432e-12"), then join with the rest ("-451161.432e-12")

(Note that I'm tossing out the thousand separators, but those could easily be added in the join step (.join(','))

var ensureDecimalSeparatorIsPeriod = function (value) {
    var numericString = value.toString();
    var splitByDecimal = numericString.replace(/[^\d.e-]/g, '.').split('.');
    if (splitByDecimal.length < 2) {
        return numericString;
    }
    var rightOfDecimalPlace = splitByDecimal.pop();
    return splitByDecimal.join('') + '.' + rightOfDecimalPlace;
};

Answer 5

This isn't necessarily more elegant, but it's another way to skin the cat:

var process = function (input) {
    var output = input;

    if (typeof input === 'string' && input !== '') {
        input = input.split('.');
        if (input.length > 1) {
            output = [input.shift(), input.join('')].join('.');
        }
    }

    return output;
};

Answer 6

You can try something like this:

str = str.replace(/\./,"#").replace(/\./g,"").replace(/#/,".");

But you have to be sure that the character # is not used in the string; or replace it accordingly.

Or this, without the above limitation:

str = str.replace(/^(.*?\.)(.*)$/, function($0, $1, $2) {
  return $1 + $2.replace(/\./g,"");
});