diff --git a/web/src/copy_and_paste.ts b/web/src/copy_and_paste.ts
index 80cc2315e1..48d8188367 100644
--- a/web/src/copy_and_paste.ts
+++ b/web/src/copy_and_paste.ts
@@ -567,7 +567,7 @@ export function paste_handler_converter(paste_html: string): string {
             const className = codeElement.getAttribute("class") ?? "";
             const language = node.parentElement?.classList.contains("zulip-code-block")
                 ? (node.closest<HTMLElement>(".codehilite")?.dataset?.codeLanguage ?? "")
-                : (className.match(/language-(\S+)/) ?? [null, ""])[1];
+                : (/language-(\S+)/.exec(className) ?? [null, ""])[1];
 
             assert(options.fence !== undefined);
             const fenceChar = options.fence.charAt(0);
diff --git a/web/src/input_pill.ts b/web/src/input_pill.ts
index 640f8dd47d..faae34c061 100644
--- a/web/src/input_pill.ts
+++ b/web/src/input_pill.ts
@@ -170,7 +170,7 @@ export function create<ItemType extends {type: string}>(
             if (value.length === 0) {
                 return true;
             }
-            if (store.split_text_on_comma && value.match(",")) {
+            if (store.split_text_on_comma && value.includes(",")) {
                 funcs.insertManyPills(value);
                 return false;
             }
diff --git a/web/src/lightbox.ts b/web/src/lightbox.ts
index 4591389d35..4f57227fb4 100644
--- a/web/src/lightbox.ts
+++ b/web/src/lightbox.ts
@@ -397,7 +397,7 @@ export function build_open_media_function(
         const payload = parse_media_data(util.the($media));
 
         assert(payload !== undefined);
-        if (payload.type.match("-video")) {
+        if (payload.type.includes("-video")) {
             display_video(payload);
         } else if (payload.type === "image") {
             display_image(payload);
@@ -509,7 +509,7 @@ export function parse_media_data(media: HTMLMediaElement | HTMLImageElement): Pa
     let original_width_px;
     let original_height_px;
     if (original_dimensions) {
-        const found = original_dimensions.match(/^(\d+)x(\d+)$/);
+        const found = /^(\d+)x(\d+)$/.exec(original_dimensions);
         if (found) {
             original_width_px = Number(found[1]);
             original_height_px = Number(found[2]);
diff --git a/web/src/util.ts b/web/src/util.ts
index daf55c007a..9c1b604fe4 100644
--- a/web/src/util.ts
+++ b/web/src/util.ts
@@ -198,8 +198,8 @@ export function find_stream_wildcard_mentions(message_content: string): string |
     // We cannot use the exact same regex as the server side uses (in zerver/lib/mention.py)
     // because Safari < 16.4 does not support look-behind assertions.  Reframe the lookbehind of a
     // negative character class as a start-of-string or positive character class.
-    const mention = message_content.match(
-        /(?:^|[\s"'(/<[{])(@\*{2}(all|everyone|stream|channel)\*{2})/,
+    const mention = /(?:^|[\s"'(/<[{])(@\*{2}(all|everyone|stream|channel)\*{2})/.exec(
+        message_content,
     );
     if (mention === null) {
         return null;