Iterate through all the matches of a regular expression and call a function

for-each-match.js

function forEachMatch(regex, str, callback) {
    if (regex.global) {
        regex.lastIndex = 0;
    }
    let i = -1, match;
    while ((match = regex.exec(str))) {
        callback(match, i++, str, regex);
    }
}