Regex to match 4 repeated letters in string using java pattern

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Published on 2010-04-12T14:26:28Z Indexed on 2010/04/12 14:33 UTC
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repeated

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characters

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regex

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java

i want to match something like aaaa, aaaad, adjjjjk. Something like this ([a-z])\1+ was used to match the repeated characters but i am not able to figure this out for 4 letters.

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