What is the best way to check if a string contains a substring in Ruby?

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What is the best way to check if a string contains a substring in Ruby?

I have a string variable with the following content:

varMessage =   
  "hi/thsid/sdfhsjdf/dfjsd/sdjfsdn\n"
  "/my/name/is/balaji.so\n"
  "call::myFunction(int const&)\n"
  "void::secondFunction(char const&)\n"
  .
  .
  .
  "this/is/last/line/liobrary.so"

I need to check if a specific substring, such as:

"hi/thsid/sdfhsjdf/dfjsd/sdjfsdn\n"
"/my/name/is/balaji.so\n"
"call::myFunction(int const&)\n"

is present in varMessage. What is the best approach to determine whether a Ruby string contains a given substring?