perl - Check whether a string contains a substring -

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How can I determine if a string contains a particular place or not?

More specifically, I have to see if s1.domain.com exists in the string variable present. 

  if (index ($ str, $ substr)! = -1) {Print "$ str $ includes substr \ n"; }   
 This will return the status of the first occurrence of  $ str  in  $ substr , or -1 if the substrings are not found.

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