Instead of trusting the prompt, just strip line numbers from diff contents

src/core/diff/strategies/search-replace.ts

@@ -131,10 +131,25 @@ Your search/replace content here
             };
         }
 
-        const [_, searchContent, replaceContent] = match;
+        let [_, searchContent, replaceContent] = match;
         
         // Detect line ending from original content
         const lineEnding = originalContent.includes('\r\n') ? '\r\n' : '\n';
+
+        // Strip line numbers from search and replace content if every line starts with a line number
+        const hasLineNumbers = (content: string) => {
+            const lines = content.split(/\r?\n/);
+            return lines.length > 0 && lines.every(line => /^\d+\s+\|(?!\|)/.test(line));
+        };
+
+        if (hasLineNumbers(searchContent) && hasLineNumbers(replaceContent)) {
+            const stripLineNumbers = (content: string) => {
+                return content.replace(/^\d+\s+\|(?!\|)/gm, '') 
+            };
+
+            searchContent = stripLineNumbers(searchContent);
+            replaceContent = stripLineNumbers(replaceContent);
+        }
         
         // Split content into lines, handling both \n and \r\n
         const searchLines = searchContent.split(/\r?\n/);