Count the number of occurrences of a Regex match on a given webpage.

RegExCounter.js

var minNumberOfOccurrencesToPrint = 3; // Min number of occurrences you care about
var documentHtml = document.documentElement.outerHTML; // Grab HTML
var occurrences = (documentHtml.match(/YourRegexGoesHere/g) || []); // Search page for occurrences, use regexpal.com to test your regex

var wordCounter = {};
for (let match of occurrences) {
    if(match in wordCounter) {
        wordCounter[match] += 1;
    } else {
        wordCounter[match] = 1;
    }
}

for (const[key, value] of Object.entries(wordCounter)) {
    if(value >= minNumberOfOccurrencesToPrint) {
        console.log(key + ": " + value);
    }
}