I have a basic form which contains a text field like this:

![My Basic Form](https://i.stack.imgur.com/plc9C.png)

But I want to control if exist any predefined word like "Mickey", If it does not exist, I want to block submitting, like validations in registration forms. This predefined word can be anywhere in textfield like "MickeyMouse" or "MouseMickey" or "MyMickeymouse".