fix #53144

src/vs/editor/contrib/snippet/snippetParser.ts

@@ -643,6 +643,9 @@ export class SnippetParser {
 		let start = this._token;
 		while (this._token.type !== type) {
 			this._token = this._scanner.next();
+			if (this._token.type === TokenType.EOF) {
+				return false;
+			}
 		}
 		let value = this._scanner.value.substring(start.pos, this._token.pos);
 		this._token = this._scanner.next();

src/vs/editor/contrib/snippet/test/snippetParser.test.ts

@@ -727,4 +727,9 @@ suite('SnippetParser', () => {
 		transform.regexp = new RegExp('foo', 'gi');
 		assert.equal(transform.toTextmateString(), '/foo/bar/ig');
 	});
+
+	test('Snippet parser freeze #53144', function () {
+		let snippet = new SnippetParser().parse('${1/(void$)|(.+)/${1:?-\treturn nil;}/}');
+		assertMarker(snippet, Placeholder);
+	});
 });