Regular verification: multiple names are separated by English commas, and each name must and can only contain numbers and letters, with a length of 2 ~ digits. How to write the regular formula?

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this format is shown in the figure! A name can be solved without a comma. Thank you

Javascript
Mar.28,2021 
/^([0-9a-zA-Z]{2,},?)+$/.test('aa,33'); //true
/^([0-9a-zA-Z]{2,},?)+$/.test('aa,33,'); //true

//
/^(?!.*,$)([0-9a-zA-Z]{2,},?)+$/.test('aa,33'); //true
/^(?!.*,$)([0-9a-zA-Z]{2,},?)+$/.test('aa,33,'); //false

//
/^((?!\d+(,|$)|[A-Za-z]+(,|$))[0-9a-zA-Z]{2,},?)+$/.test('aa2,3w3'); //true
/^((?!\d+(,|$)|[A-Za-z]+(,|$))[0-9a-zA-Z]{2,},?)+$/.test('aa2,33'); //false
/^((?!\d+(,|$)|[A-Za-z]+(,|$))[0-9a-zA-Z]{2,},?)+$/.test('aa2,3d3,'); //true

//
/^((?!\d+(,|$)|[A-Za-z]+(,|$)|.*,$)[0-9a-zA-Z]{2,},?)+$/.test('aa2,3e3,'); //false
/^((?!\d+(,|$)|[A-Za-z]+(,|$)|.*,$)[0-9a-zA-Z]{2,},?)+$/.test('aa2,3e3'); //true
var reg=/^((?![a-z]{2,},)(?![0-9]{2,},)[a-z0-9]{2,},)*(?![a-z]{2,}$)(?![0-9]{2,}$)[a-z0-9]{2,}$/i;
    console.log(reg.test('aaa1'),reg.test('aaa1,'),reg.test('aaa1,aaa2'),reg.test('aaa,aaa2'),reg.test('aaa2,222'),reg.test('aaa'));

try this

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