Question

Which lines in this excerpt from act V of Shakespeare's Macbeth tell the audience that Macbeth realizes his mistake and regrets his ambition?

Answer 1

-I have liv'd long enough: my way of life

Is fall'n into the sear, the yellow leaf;

Answer 2

Correct me If I am wrong. Are you mentioning this part of the fifth act?  In that case I highlight the lines where Macbeth tells the audience that Macbeth realizes his mistake and regrets his ambition.

Will chair me ever or disseat me now.
I have liv'd long enough: my way of life Is fall'n into the sear, the yellow leaf;
 And that which should accompany old age,
 As honour, love, obedience, troops of friends,
I must not look to have;
but, in their stead,
Curses, not loud but deep, mouth-honour, breath,
Which the poor heart would fain deny, and dare not.