What is maximum allowed length of iOS BundleId?

Question

I am trying to come up with regex to validate iOS app's bundle id. This link was quite helpful. However I also need to validate length of supplied bundleid as well as length of strings between dots (here I am assuming there would be such restrictions from Apple) . For example, in bundle id 'com.company.project' I need to ensure 'company', 'project' etc are also within in allowed limit. I tried finding any apple docs that talks about maximum allowed bundle id but I couldn't. Is it like any length is allowed? Any help appreciated.

Answer 1

Apparently 155 characters.

Checked in Apple Developer Account as seen below:

Also, it could be one long character set without .'s

Answer 2

From inspecting the HTML of the create App ID page on May 14, 2018, here are the constraints including a regular expression to validate the bundle identifier:

Name

• Maximum Length: 50
• Pattern: ^[0-9A-Za-z\\d\\s]+$

Bundle Identifier

• Maximum Length: 155
• Pattern: ^[A-Za-z0-9\\.\\-]+$

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The original question was a regular expression to validate bundle identifiers, you could use this to do that:

^[A-Za-z0-9\.\-]{1,155}$