Replace last letter with the corresponding alphabet number?

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Using a renamer application which is doing various stuff using Javascript, I am trying to replace the last letter of some filenames, to the corresponding alphabet number. For example, from "Filename AA" to "Filename A1", from "Filename AB" to "Filename A2" etc.

What I have tried:

This application gives me this function by default...

JavaScript

function(index, item) { }

And I have to write my code in there, which could looks like this...

JavaScript

function(index, item) {return item.newBasename...etc}.

Based on this example below, how can I do this?

JavaScript

function(index, item) {
    return item.newBasename.replace(???);
}

Posted 20-Oct-18 2:08am

Simos Sigma

Updated 20-Oct-18 23:41pm

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Comments

Patrice T 20-Oct-18 8:56am

RegEx looks like the complicated way to me.
you should try 'string functions'

Afzaal Ahmad Zeeshan 20-Oct-18 10:12am

Is it always the last character you want to replace, or is there any other complexity involved, like only replace it duplicate, etc?

I find the regex and overkill way of doing this, you can easily do, an easy way to do will be inserting the number at second last index, and removing last character. 2 operations, yes, but simple and understandable.

Simos Sigma 21-Oct-18 5:03am

Yes my friend, it's always the last letter(!!!) which I want to replace. Can I have an example of your solution please?

2 solutions

Solution 1

Based on your post, you can update the code to use the following example. The below example will replace the last character of a string with a corresponding alphabet number.

JavaScript

var s = "Filename AA";
s = s.replace(/\w([^\w]*)$/, "1");
console.log(s); //Filename A1

var s = "Filename A1";
s = s.replace(/\w([^\w]*)$/, "B");
console.log(s);  //Filename AB

Posted 20-Oct-18 16:24pm

Bryian Tan

Comments

Simos Sigma 21-Oct-18 5:11am

Thank you for your answer my friend but with your example, all my filenames will change to 1 at it's last letter. I don't want this. Let's say I have this files...
Filename AA, Filename AB, Filename AC etc. What I want to do is this... Filename A1, Filename A2, Filename A3!!!

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Simos Sigma · Accepted Answer · 2018-10-20T23:42:00

Solution 2

I finally found the solution...

JavaScript

function(index, item) {
    str=item.newBasename;
    num=str.toUpperCase().slice(-1).charCodeAt(0) - 64;
    if (num>0 && num < 27) str = str.slice(0, str.length - 1) + num;
    return str; 
}

Posted 20-Oct-18 23:42pm

Simos Sigma