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hi friends this is leela welcome to my channel lila webbed up to now we have we are learning about these groups concepts so a regular expression groups concept we are learning capture groups non-capture groups we have also seen about this positive look ahead now in this video we will try to see about the negative look ahead and also the look behind concept also so there is there is also one more concept left left in this group concept that is nothing but left behind i will try to show you the simple examples what it will try to do so we have already seen about this one in the password string so here we are having some capital address and one small letter like this we are having and if you want to try we can use the pause to look ahead something like this and it should be start and end you can add it okay you can add it like this and here you need to have something like the first one is it should be it should be off we can have a positive look ahead so dot and it should be of eight char