bash - check for string to be list of integers separated by + signs in python -

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I want to see that the mivar be divided by more than one integer + . Should it be re.search () enough? 

  myvar = "1 + 2 + 3" if (re-search (r "^ [0- 9] + (\ + [0-9] +) * $", miver) : "Print" should be an integer integer (% s) "% myvar sys.exit (1)   
 Then I realized that it would still work for the wrong cases such as:  
  myvar = "1 + 2 + 3-4"    
 
 
 Use a regex free alternative partition:  
  myvars = ["+1", "1 + 2 + 2", "1 + 5", "1 + 2 + 3 "] for myvars in hevor: nums = myvar.split ('+') for num: num: try: int (num): print" error ", myover   
 < em> returns:   
  error +1 error 1++ 2

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