Regular validation related issues, 6-16-bit letters or numbers

Regular validation issues, 6-16-bit letters or numbers
Regular validation issues, 6-16-bit letters or numbers
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Can it be a letter + number or a letter or a number?
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/[0-9]///Digital
/[a-za-z]///Letter
/[a-z0-9]///numbers + letters
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Allow a string of pure letters or numbers
/^[a-z0-9]{6,16}$/

Must contain both letters and numbers
/^(?=. {6,16}) (? =.*[a-z]) (? =.*[0-9]) [0-9a-z]*$/
------to solve the idea----------------------
/^[a-z0-9]{6,16}$/i

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