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function search() {
var searchTerm = document.getElementById('searchfield').value;
var searchableElements = document.getElementsByTagName('section');
var regexMatch = new RegExp(searchTerm, "i");
for(var i = 0; i < searchableElements.length; i++) {
var textValue = searchableElements[i].getAttribute('data-ref');
if(textValue != null) {
if(textValue.match(regexMatch) == null && searchableElements[i].style.display != "none") {
searchableElements[i].style.display = "none";
} else if(textValue.match(regexMatch) != null) {
searchableElements[i].style.display = "block";
}
}
}
}
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