https://varelaya.com/search.js

1const normalize = value => String(value ?? '').normalize('NFD').replace(/[\u0300-\u036f]/g, '').toLowerCase();
2const stopWords = new Set(['de','del','la','el','los','las','y','en','un','una','al','por','para']);
3function singular(word) {
4  if (['jeans','tenis','lentes'].includes(word)) return word;
5  if (word.length > 4 && word.endsWith('ces')) return word.slice(0,-3)+'z';
6  if (word.length > 4 && /[aeiou]s$/.test(word)) {
7    if (/(?:n|r|l|d|j)es$/.test(word)) return word.slice(0,-2);
8    return word.slice(0,-1);
9  }
10  if (word.length > 4 && word.endsWith('s')) return word.slice(0,-1);
11  return word;
12}
13const tokens = value => (normalize(value).match(/[a-z0-9]+/g) || []).filter(word => !stopWords.has(word)).map(singular);
14// Each meaningful query word must match. Prefixes allow natural partial searches.
15export function matchesSearch(text, query) {
16  const terms = tokens(query);
17  if (!terms.length) return true;
18  const words = tokens(text);
19  return terms.every(term => words.some(word => word === term || (term.length >= 3 && word.startsWith(term))));
20}