How to trim a text box or replace a single letter at a specific index?

[anandavardhana57zwwl]

I played with it and it does not work. Infact this is a very good reference

Tips for working with text

Is Empty The is empty block can be used to check whether or not a string, or piece of text, contains and characters. This block returns true if there are no characters in the string and returns false if there is one or more characters in a string. [isEmpty] Example 1 In this example we want to make sure that the user has typed something into Text_Input1. There are a couple of ways to do this. These blocks do nothing if Text_Input1 is empty and only greet the user if they have typed in the t…

But none could do what I want. Let me reword my questions
Given a text string say 2453635656 if I want to remove the digit at index 3 5 and 8 how would I do it?
Given a text string say 2453635656 if I want to replace the digit at #3 by 2, the digit at #5 by 1 and the digit at #8 by 4 how would I do it? All I need is some hint or a nudge in the right direction and I will put the effort. Thanks