Edit fiddle - JSFiddle - React, Tailwind, and code Playground

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HTML

<textarea type="text" name="featured[items][58252][hpsummary]" cols="50" class="limit20_120">asdfasdfasfasfdsadfasdfaasdfasfdasfasfasdf</textarea>
 <textarea type="text" name="featured[items][582523][hpsummary]" cols="50" class="limit20_120">asdfasdfasfasfdsadfasdfaasdfasfdasfasfasdf</textarea>

JavaScript

$('.limit20_120').each(function(i){
        this.name = this.name.replace(/\d+/, i+1);
 });

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JSFiddle - React, Tailwind, and code Playground

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Join the 4+ million users, and keep the JSFiddle dream alive.

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Use pre-released features

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Console