Validate if a string follows the Salesforce ID format pattern. A valid Salesforce ID is 15 or 18 characters long and contains only alphanumeric characters.

Examples:

Input: id = "0015f00000ZSL7hAAH" Output: true Explanation: This is a valid 18-character Salesforce ID Input: id = "ABC123" Output: false Explanation: This string is too short to be a valid Salesforce ID
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