regex - regexp accepts either all numbers or all letters -

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i need regexp works this: accepts strings made of numbers or letters (for example: "111111111111","aaaaaaaa", not "aaaaa11111").

i tried /(^[0-9]+$) | (^[a-z]$)/.test('111111111111'), not working though. what's right way ?

first, remove spaces, , second, [a-z] lacking +. so, working version is:

/(^[0-9]+$)|(^[a-z]+$)/

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