Flex lexical analyser

So you know how when you read a book, you understand the words because you learned what they mean? Well, a computer has to do the same thing before it can understand what you want it to do.

A "flex" lexical analyzer is like a teacher that helps the computer learn what each word means. It looks at a bunch of text and separates it into different parts called "tokens." This is kind of like sorting candy into different piles based on their colors.

Then, the lexical analyzer gives each token a special code that helps the computer understand what it means. This is like putting a tag on each piece of candy that tells you what it is.

The computer can then use these codes to figure out what to do with the text it's given. So, if you tell it to count how many times a certain word appears, it can use the codes to find and count all the matching tokens.

Overall, a "flex" lexical analyzer is like a special teacher that helps the computer learn the meaning of words so that it can understand and follow your commands. Pretty cool, right?