The simplest working, but ugly way:
document.querySelector('.myclass').innerHTML = document.querySelector('.myclass').innerHTML.replace(/<\/a>,/g, '</a>;');
Nicer way, though still ugly:
var toReplace = document.querySelector('.myclass');
toReplace.innerHTML = toReplace.innerHTML.replace(/<\/a>,/g, '</a>;');
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solved How to replace comma with semi colon for inner html or text