regex - SQL wildcards: Dictating amount of characters and values for each character -


i want specific substring between 3 , 5 characters. each character can numeric [0-9] or [a-z].

the substring i'm looking either word or number. know how dictate exact amount of chars "_" , using "[]" tell sql characters i'm looking how mix them?

i've tried kind of nonsense nothing worked.

this dirty works (at least in c# ):

\b\w{3}\b|\b\w{4}|\b\\bw{5}\b

you can replace \w [a-za-z0-9] if need to, \w includes _


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