What is the shortest notation for this regex?

We've determined that this regex works for validating a certain field, but would like it to be shorter since it will be repeated numerous times:

\D\D\d\d\d\D\d\d\D-\d\d\d 

What is the 开发者_运维问答shortest notation that would still validate the same as the above regex?

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Not really shorter, but maybe more readable.

\D{2}\d{3}\D\d{2}\D-\d{3}

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I don't know if it's shorter, but this definitely is easier to read:

\D{2}\d{3}\D\d{2}\D-\d{3}

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\D\D\d{3}\D\d\d\D-\d{3} - only marginally shorter.

Easier to read, although longer: \D{2}\d{3}\D\d{2}\D-\d{3}

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What about

\D{2}\d{3}\D\d{2}\D-\d{3} 

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Since \D{2} are 5 chars, this is shorter:

\D\D\d{3}\D\d\d\D-\d{3}

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Another solution, same length but groups 3 characters that are repeated twice

\D{2}\d(\d{2}\D){2}-\d{3}