android - 正则表达式匹配Android包名

Question

如何检查字符串是否是有效的 Android 包名称？

Answer 1

包属性的 AndroidManifest 文档中描述了一个有效的 Android 包名称:

The name should be unique. The name may contain uppercase or lowercase letters ('A' through 'Z'), numbers, and underscores ('_'). However, individual package name parts may only start with letters.

见: https://developer.android.com/guide/topics/manifest/manifest-element.html#package

以下正则表达式将匹配一个有效的 Android 包名称:

^([A-Za-z]{1}[A-Za-z\d_]*\.)+[A-Za-z][A-Za-z\d_]*$

示例用法:

String regex = "^([A-Za-z]{1}[A-Za-z\\d_]*\\.)+[A-Za-z][A-Za-z\\d_]*$";
List<PackageInfo> packages = context.getPackageManager().getInstalledPackages(0);
for (PackageInfo packageInfo : packages) {
  if (packageInfo.packageName.matches(regex)) {
    // valid package name, of course.
  }
}

有关正则表达式的详细说明，请参阅: https://regex101.com/r/EAod0W/1