allow mentioning users instead of using userids

utils/userUtils.js

@@ -0,0 +1,27 @@
+function extractUserId(input) {
+    if (/^\d{17,19}$/.test(input)) {
+        return input;
+    }
+
+    const mentionRegex = /<@!?(\d{17,19})>/;
+    const match = input.match(mentionRegex);
+
+    if (match && match[1]) {
+        return match[1];
+    }
+
+    return null;
+}
+
+function processUserInput(input) {
+    return input
+        .split(',')
+        .map(part => part.trim())
+        .map(part => extractUserId(part))
+        .filter(id => id !== null);
+}
+
+module.exports = {
+    extractUserId,
+    processUserInput
+};