regret vs sob

regret

verb
  • To feel sorry about (any thing). 

  • To feel sorry about (a thing that has or has not happened), afterthink: to wish that a thing had not happened, that something else had happened instead. 

noun
  • Emotional pain on account of something done or experienced in the past, with a wish that it had been different; a looking back with dissatisfaction or with longing. 

  • The amount of avoidable loss that results from choosing the wrong action. 

sob

verb
  • To say (something) while sobbing. 

  • To soak. 

  • To weep with convulsive gasps. 

noun
  • A cry with a short, sudden expulsion of breath. 

  • sound of sob 

How often have the words regret and sob occurred in a corpus of books? (source: Google Ngram Viewer )