Is it possible if I could detect if they is a character or word in a text box? (solved)

I know this isn't a request site and that this should be a question, but is it possible to detect if there is a character in a text box. Like the text box is labeled "words are fun", I want to see if the script can detect if "words" is in the text or maybe if i type "a b c" im looking for a and it will print if we find a

im sorry that this question isnt valid