How can I write a regex to find only numbers with four digits?

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I am trying to write a regex in Ruby to search a string for numbers of only four digits. I am using
/\d{4}/ but this is giving me number with four and more digits.

Eg: "12345-456-6575 some text 9897"

In this case I want only 9897 and 6575 but I am also getting 1234 which has a length of five characters.

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