This kind of questions is better asked on StackOverflow community.
Maybe this JS hack would help:
var elem = document.querySelector('.search-form input[name="search_keywords"]');
if ( null !== elem ) {
elem.onchange = function() {
var e = this
, v = e.value;
if ( ! v ) return;
v = v.toString();
if ( 0 === v.indexOf(0) ) {
v = v.substring(1);
var zero = true;
}
v = v.match(/.{1,3}/g);
v = v.toString().replace(/,/g, ' ');
if ( zero && v ) v = "0" + v;
if ( v ) elem.value = v;
}
}
Add it to your main JS file or to the footer using wp_footer
action hook
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