Refactor sentence splitting to avoid unsupported lookbehind in low-version iOS Safari

- Updated `splitSentences` function in `common.ts` to replace lookbehind regex with a compatible approach for older browsers.
- Modified `getSelectionSentence` function in `mouseEvent.ts` to similarly avoid lookbehind, ensuring better compatibility across different environments.

src/utils/common.ts

@@ -1586,10 +1586,15 @@ export const splitSentences = (text: string, maxLength?: number) => {
     if (sentence.length <= resolvedMaxLength) return [sentence];
 
     // Try splitting by common punctuation marks (Chinese and Western)
-    const parts = sentence
-      .split(/(?<=[,，;；:：、…])/)
-      .map((s) => s.trim())
-      .filter((s) => s.length > 0);
+    // Avoid lookbehind (?<=) which is unsupported on low-version iOS Safari
+    const rawParts = sentence.split(/([,，;；:：、…])/);
+    const parts = [] as string[];
+    for (let i = 0; i < rawParts.length; i += 2) {
+      const merged = (rawParts[i] + (rawParts[i + 1] ?? "")).trim();
+      if (merged.length > 0) {
+        parts.push(merged);
+      }
+    }
 
     if (parts.length > 1) {
       // Greedily merge parts to minimize the number of resulting chunks

src/utils/reader/mouseEvent.ts

@@ -72,7 +72,12 @@ export const getSelectionSentence = (
       let fullText = (el as Element)?.textContent || "";
       let selectedText = sel.toString().trim();
       // Split on sentence-ending punctuation to find the sentence
-      let sentences = fullText.split(/(?<=[.!?。！？])\s*/);
+      // Avoid lookbehind (?<=) which is unsupported on low-version iOS Safari
+      const rawParts = fullText.split(/([.!?。！？])\s*/);
+      const sentences: string[] = [];
+      for (let i = 0; i < rawParts.length; i += 2) {
+        sentences.push(rawParts[i] + (rawParts[i + 1] ?? ""));
+      }
       for (let s of sentences) {
         if (s.includes(selectedText)) {
           return s.trim();