VS代码扩展API -替换文档中的字符串？

const vscode = require('vscode');

function activate(context) {
    let disposable = vscode.commands.registerCommand('extension.replaceString', function () {
        const editor = vscode.window.activeTextEditor;
        if (editor) {
            const document = editor.document;
            const text = document.getText();
            const regex = /要替换的字符串/g;
            const newText = text.replace(regex, '替换后的字符串');

            editor.edit(editBuilder => {
                const start = new vscode.Position(0, 0);
                const end = new vscode.Position(document.lineCount - 1, document.lineAt(document.lineCount - 1).text.length);
                const range = new vscode.Range(start, end);
                editBuilder.replace(range, newText);
            });
        }
    });

    context.subscriptions.push(disposable);
}
exports.activate = activate;