@modern-kit/utils/dist/string/countSubstringOccurrences/index.mjs

modern-kit/utils

const escapeRegExp = (str) => {
  const escaped = str.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
  return new RegExp(escaped, "g");
};
const countAllowOverlap = (source, target) => {
  const regex = escapeRegExp(target);
  let count = 0;
  let match = regex.exec(source);
  while (match !== null) {
    count++;
    regex.lastIndex = match.index + 1;
    match = regex.exec(source);
  }
  return count;
};
const countExceptOverlap = (source, target) => {
  const regex = escapeRegExp(target);
  const matches = source.match(regex);
  return matches ? matches.length : 0;
};

function countSubstringOccurrences(source, target, options = { overlap: false }) {
  if (target === "") return 0;
  return options.overlap ? countAllowOverlap(source, target) : countExceptOverlap(source, target);
}

export { countSubstringOccurrences };
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