java - Match a character exactly once with regex -

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how can match character once regex in java? let's want strings contain 1 time digit 3, , doesn't matter is.

i tried ".*3{1}.*" match "330" specified period don't care character is. how can fix this?

^[^3]*3[^3]*$

match (not three), three, (not three).

edit: adding ^ , $ @ beginning , end. force regex match whole line. @bobbyrogers , @mindastic


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