Regex: Fix markdown format bugs

If a regex cannot be parsed, silently return out and don't run the
script. May be a good idea to display a toast message saying the
script didn't run.

Also only reload the chat if a chat is actually loaded.

Signed-off-by: kingbri <bdashore3@proton.me>

public/scripts/extensions/regex/engine.js

@@ -14,8 +14,9 @@ const regex_placement = {
     SENDAS: 4
 }
 
-// From: https://github.com/IonicaBizau/regex-parser.js/blob/master/lib/index.js
+// Originally from: https://github.com/IonicaBizau/regex-parser.js/blob/master/lib/index.js
 function regexFromString(input) {
+    try {
         // Parse input
         var m = input.match(/(\/?)(.+)\1([a-z]*)/i);
     
@@ -26,6 +27,9 @@ function regexFromString(input) {
     
         // Create the regular expression
         return new RegExp(m[2], m[3]);
+    } catch {
+        return;
+    }
 }
 
 function getRegexedString(rawString, placement, { characterOverride } = {}) {
@@ -52,6 +56,12 @@ function runRegexScript(regexScript, rawString, { characterOverride } = {}) {
     let match;
     let newString;
     const findRegex = regexFromString(regexScript.substituteRegex ? substituteParams(regexScript.findRegex) : regexScript.findRegex);
+
+    // The user skill issued. Return with nothing.
+    if (!findRegex) {
+        return;
+    }
+
     while ((match = findRegex.exec(rawString)) !== null) {
         const fencedMatch = match[0];
         const capturedMatch = match[1];

public/scripts/extensions/regex/index.js

@@ -1,4 +1,4 @@
-import { callPopup, eventSource, event_types, reloadCurrentChat, saveSettingsDebounced } from "../../../script.js";
+import { callPopup, eventSource, event_types, getCurrentChatId, reloadCurrentChat, saveSettingsDebounced } from "../../../script.js";
 import { extension_settings } from "../../extensions.js";
 import { uuidv4, waitUntilCondition } from "../../utils.js";
 import { regex_placement } from "./engine.js";
@@ -50,9 +50,12 @@ async function saveRegexScript(regexScript, existingScriptIndex) {
 
     // Markdown is global, so reload the chat.
     if (regexScript.placement.includes(regex_placement.MD_DISPLAY)) {
+        const currentChatId = getCurrentChatId();
+        if (currentChatId !== undefined && currentChatId !== null) {
             await reloadCurrentChat();
         }
     }
+}
 
 async function deleteRegexScript({ existingId }) {
     let scriptName = $(`#${existingId}`).find('.regex_script_name').text();