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javascript - Regex for Vehicle registration number

I want a regular expression for identifying Vehicles' registration number. A valid registration number must be contain 10 characters or digits but no special characters or whitespaces. For example KA01AB1234 is a valid registration number whereas KA01AB 234 is not.

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What about it:

Pattern.compile("^[A-Z]{2}[0-9]{2}[A-Z]{2}[0-9]{4}$")

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