Finite State Machine as String Validator (Part -1)
I coded Instagram's username validator in Java (using only string methods)
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Last Updated: October 30, 2026
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Check us out on Social Media at facebook.com/KnowledgeMavens instagram.com/knowledge_mavens/ ... If you would to support me, please , & , and check me out on Patreon: ... python on instagram instagram.com/linux.programming/ join ... It allow only the characters not numbers. StringLength (Max , MinimumLength=min , ErrorMessage="Message")] In this video, we implement the Every time you sign up on Instagram, your username passes through a