LUA

if string contains lua

str = "This is some text containing the word tiger."
if string.find(str, "tiger") then
  print ("The word tiger was found.")
else
  print ("The word tiger was not found.")
end

check if string contains word lua

ourstring = "example"
if string.match(ourstring,"ex") then
   print(ourstring.." contains ex!"
end

-- OR

if string.find(ourstring,"ex") then
   print(ourstring.." contains ex!"
end