yaml-unist-parser/lib/utils/find-last-char-index.js

A YAML parser that produces output compatible with unist

export function findLastCharIndex(text, from, regex) {
    for (let i = from; i >= 0; i--) {
        if (regex.test(text[i])) {
            return i;
        }
    }
    // istanbul ignore next
    return -1;
}