如何用JavaScript正则验证多格式Android App ID？

Got it, let's fix this regex to cover all the valid Android Bundle ID formats you've encountered on Google Play. Your original regex was too restrictive—it only matched 3-segment IDs starting with com, but we need to support arbitrary prefixes (like eu, au) and any number of segments beyond two.

The Updated Regex #

Here's a regex that handles all the cases you mentioned, plus standard valid Bundle IDs:

/^[a-z]+\.[a-z]+(\.[a-z]+)*$/

Breakdown of the Regex #

Let's break down what each part does:

• ^: Anchors the match to the start of the string (prevents partial matches)
• [a-z]+: Matches the first segment (one or more lowercase letters—covers com, eu, au, etc.)
• \.: Matches the dot separator
• [a-z]+: Matches the second segment (required, so we don't allow invalid IDs like com. or .example)
• (\.[a-z]+)*: Matches zero or more additional segments (each starting with a dot followed by lowercase letters)—this is what lets us support 3, 4, or more segments like au.gh.cc.com or com.example.jk.com
• $: Anchors the match to the end of the string (ensures no extra characters are present)

Test Code Snippet #

Here's how to implement this in your JavaScript code, with test cases for all your examples:

<script>
function validateBundleId(id) {
  const regexp = /^[a-z]+\.[a-z]+(\.[a-z]+)*$/;
  return regexp.test(id);
}

// Test your sample IDs
console.log(validateBundleId("com.example.com")); // true
console.log(validateBundleId("eu.og.com")); // true
console.log(validateBundleId("au.gh.cc.com")); // true
console.log(validateBundleId("com.example.jk.com")); // true

// Additional edge cases
console.log(validateBundleId("com.example")); // true (valid 2-segment ID)
console.log(validateBundleId("invalid-id")); // false (no dot separators)
console.log(validateBundleId("com.")); // false (incomplete final segment)
</script>

Optional Enhancements #

• If you need to support uppercase letters (though Google Play typically uses lowercase), add the case-insensitive flag i at the end: /^[a-z]+\.[a-z]+(\.[a-z]+)*$/i
• Android Bundle IDs can also include numbers and underscores in segments (e.g., com.my_app.123). To cover those cases, update the character set to [a-z0-9_]: /^[a-z0-9_]+\.[a-z0-9_]+(\.[a-z0-9_]+)*$/i

内容的提问来源于stack exchange，提问作者Shasha