Validating a Salesforce Id

Question

Is there a way to validate a Salesforce ID, maybe using RegEx? They are normally 15 chars or 18 chars but do they follow a pattern that we can use to check that it's a valid id.

Answer 1

There are two levels of validating salesforce id:

1. check format using regular expression [a-zA-Z0-9]{15}|[a-zA-Z0-9]{18}
2. for 18-characted ids you can check the the 3-character checksum:

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