diff --git a/ext/bg/js/audio.js b/ext/bg/js/audio.js
index 9bbbf902..dc0ba5eb 100644
--- a/ext/bg/js/audio.js
+++ b/ext/bg/js/audio.js
@@ -107,7 +107,7 @@ const audioUrlBuilders = {
     'custom': async (definition, optionsContext) => {
         const options = await apiOptionsGet(optionsContext);
         const customSourceUrl = options.audio.customSourceUrl;
-        return customSourceUrl.replace(/\{([^\}]*)\}/g, (m0, m1) => (hasOwn(definition, m1) ? `${definition[m1]}` : m0));
+        return customSourceUrl.replace(/\{([^}]*)\}/g, (m0, m1) => (hasOwn(definition, m1) ? `${definition[m1]}` : m0));
     }
 };
 
@@ -133,7 +133,7 @@ function audioUrlNormalize(url, baseUrl, basePath) {
                 // Begins with "/"
                 url = baseUrl + url;
             }
-        } else if (!/^[a-z][a-z0-9\+\-\.]*:/i.test(url)) {
+        } else if (!/^[a-z][a-z0-9\-+.]*:/i.test(url)) {
             // No URI scheme => relative path
             url = baseUrl + basePath + url;
         }
diff --git a/ext/bg/js/dictionary.js b/ext/bg/js/dictionary.js
index affce9e9..409bed85 100644
--- a/ext/bg/js/dictionary.js
+++ b/ext/bg/js/dictionary.js
@@ -322,7 +322,7 @@ async function dictFieldFormat(field, definition, mode, options, exceptions) {
         compactGlossaries: options.general.compactGlossaries
     };
     const markers = dictFieldFormat.markers;
-    const pattern = /\{([\w\-]+)\}/g;
+    const pattern = /\{([\w-]+)\}/g;
     return await stringReplaceAsync(field, pattern, async (g0, marker) => {
         if (!markers.has(marker)) {
             return g0;
diff --git a/ext/bg/js/search.js b/ext/bg/js/search.js
index ae76c23b..552b7a59 100644
--- a/ext/bg/js/search.js
+++ b/ext/bg/js/search.js
@@ -207,7 +207,7 @@ class DisplaySearch extends Display {
     async onSearchQueryUpdated(query, animate) {
         try {
             const details = {};
-            const match = /[\*\uff0a]+$/.exec(query);
+            const match = /[*\uff0a]+$/.exec(query);
             if (match !== null) {
                 details.wildcard = true;
                 query = query.substring(0, query.length - match[0].length);
@@ -356,7 +356,7 @@ class DisplaySearch extends Display {
     }
 
     static getSearchQueryFromLocation(url) {
-        let match = /^[^\?#]*\?(?:[^&#]*&)?query=([^&#]*)/.exec(url);
+        let match = /^[^?#]*\?(?:[^&#]*&)?query=([^&#]*)/.exec(url);
         return match !== null ? decodeURIComponent(match[1]) : null;
     }
 }
diff --git a/ext/fg/js/document.js b/ext/fg/js/document.js
index 3dd12a40..10dea7df 100644
--- a/ext/fg/js/document.js
+++ b/ext/fg/js/document.js
@@ -17,7 +17,7 @@
  */
 
 
-const REGEX_TRANSPARENT_COLOR = /rgba\s*\([^\)]*,\s*0(?:\.0+)?\s*\)/;
+const REGEX_TRANSPARENT_COLOR = /rgba\s*\([^)]*,\s*0(?:\.0+)?\s*\)/;
 
 function docSetImposterStyle(style, propertyName, value) {
     style.setProperty(propertyName, value, 'important');
diff --git a/ext/fg/js/popup.js b/ext/fg/js/popup.js
index df784029..c40e5d60 100644
--- a/ext/fg/js/popup.js
+++ b/ext/fg/js/popup.js
@@ -303,7 +303,7 @@ class Popup {
     }
 
     static getColorInfo(cssColor) {
-        const m = /^\s*rgba?\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*(?:,\s*([\d\.]+)\s*)?\)\s*$/.exec(cssColor);
+        const m = /^\s*rgba?\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*(?:,\s*([\d.]+)\s*)?\)\s*$/.exec(cssColor);
         if (m === null) { return null; }
 
         const m4 = m[4];
diff --git a/ext/mixed/js/audio.js b/ext/mixed/js/audio.js
index 7d5ffedd..35f283a4 100644
--- a/ext/mixed/js/audio.js
+++ b/ext/mixed/js/audio.js
@@ -68,7 +68,7 @@ class TextToSpeechAudio {
     }
 
     static createFromUri(ttsUri) {
-        const m = /^tts:[^#\?]*\?([^#]*)/.exec(ttsUri);
+        const m = /^tts:[^#?]*\?([^#]*)/.exec(ttsUri);
         if (m === null) { return null; }
 
         const searchParameters = {};