A string 24 characters in length and only with hexadecimal letters and numbers
Example use: In MongoDb the unique id’s (ObjectId)
The string must be 24 characters long. ^ Starts of string or start of line, $ end of string or line; both dependent on the “multi-line mode”
/^{24}$/Hexadecimal uses only the letters “a to f” and the number “0 to 9”
/^[a-f0-9]{24}$/
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