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all right we are going to go over how to write a regex a comprehensive regex for a phone number this is going to cover many many phone numbers we're going to start writing our regex based on this particular one right here and then as we write it will kind of expand on the different options that someone has to run a phone number what I mean by options is they could write one two three one two three one two three four they could write 1 2 3 . 1 2 3 . 1 2 3 4 they get to 8 1 2 3 . 1 2 3 - 1 2 3 4 whatever okay they can have many many different options and writing phone numbers let's get started so we need to start first with this first parenthesis now the parenthesis optional does not have to be there so in order to start with the parenthesis you can't just write a parenthesis because parenthesis is used in regex it's capturing parentheses it's actually something you need so in order to use it to actually match with it you have to escape it so we will start by escaping with the slash then we said it's optional so we need a modifier meaning question mark what I mean by question mark it says 0 or 1 that's what a question mark means 0 or 1 so we're saying 0 or 1 parenthesis ok next thing 3 numbers ok 3 numbers so that's backslash d 4 digits and then in curly braces the number 3 this says give me 3 digits and only 3 digits no more no less okay the next thing is a clothing closing parenthesis same thing as the other parenthesis you can't just write a parenthesis you have to escape the parentheses and it's optional we may may not be there that's question mark the next thing is a space okay so in our case it's just backslash s however the space may not be there so question mark but we may not have a space we may have a dash or a dot so you can have a dash question mark it may not be there and we can have a dot but again a dot is used in regex so we can't just write dot we need backslash dot and that's another question mark because it may not be there as well this is okay to do but this is actually really redundant we've got three three occurrences all with the same model so FAQ /s - and dot they all have the same exact modifier whenever you see that that means you can wrap this all in square brackets meaning a character class we're going to put all three of these now in a character class and just end it with a single question mark instead of doing these three redundant like this let's delete all this okay we'll make a character...