Get and replace the last number on a string with JavaScript or jQuery

Question

If I have the string:

var myStr = \"foo_0_bar_0\";

and I guess we should have a function called getAndIncrementLastNumber(str)

Answer 1

try this demo please http://jsfiddle.net/STrR6/1/ or http://jsfiddle.net/Mnsy3/

code

existingId = 'foo_0_bar_0';
newIdOnly = existingId.replace(/foo_0_bar_(\d+)/g, "$1");
alert(newIdOnly);

getAndIncrementLastNumber(existingId);

function getAndIncrementLastNumber(existingId){
    alert(existingId);
newId = existingId.replace(/(\d+)/g, function(match, number) {
    return parseInt(number) + 1;
});
alert(newId);
}
​

or

   existingId = 'foo_0_bar_0';
newIdOnly = existingId.replace(/foo_0_bar_(\d+)/g, "$1");
alert(newIdOnly);

getAndIncrementLastNumber(existingId);

function getAndIncrementLastNumber(existingId){
    alert(existingId);
    newId = existingId.replace(/\d+$/g, function(number) {
    return parseInt(number) + 1;
});
alert("New ID ==> " + newId);
}
​