Hi there,
to be able to find some key words in a field using strings, you can use the function indexOf();
This function is known to return the index of a value inside an array, for a string the indexOf() function is used to return the index of the first character where the value is found...
E.g.:
If your value is found in the string, it will return its index, but if there is no instance of the value you are looking for, it will return -1 (false)
So..
Hope this help!