[Solved] Filter input amount at specific points in regex? [closed]

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[A-Za-z0-9]{1,254} Indicates ,

any character of: 'A' to 'Z', 'a' to 'z',
'0' to '9'

(between 1 and 254 times
(matching the most amount possible)),

enter image description here

Edit: If you need @ at the end try with the regex [A-Za-z0-9]{1,254}@

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solved Filter input amount at specific points in regex? [closed]