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hello guys welcome to my channel again so this video is again in continuation uh with the already ongoing hackering series you can see a lot of videos on in my channel the title hacker inc and java as a skill so before we jump on to this problem valid username regular expression if you are new to my channel uh please uh feel free to subscribe its free completely free tax free and it will keep me motivated enough to make more videos and which is obviously going to help me a lot so lets jump back to the problem so as you can understand from the title um this is nothing related to that so it somehow feels like uh what you do when you log in or sign up when you actually sign up to a website for the first time they have like a username thing which should be unique so they make a few constraint like it should not be um having less than eight characters something like that so these are those constraint which they are saying as validity so the first constraint is that the username length sh