Question

I need to search a string for any numbers in it and increase the numbers by 1. So that this 'sermon[thesis][1][name][2]' becomes 'sermon[thesis][2][name][3]'.

Answer 1

This will do the trick:

"sermon[thesis][1][name][2]".replace(/\[(\d+)\]/g, function(match, number) {
    return "[" + (Number(number) + 1) + "]";
});

Working demo: jsFiddle.

EDIT:

To increment the last number, you would add a dollar sign $ before the last /, here’s a demo: jsFiddle.