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Alex Rivera
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I get this error: java.util.regex.PatternSyntaxException: Look-behind group does not have an obvious maximum length near index 22 ([a-z])(?!.*\1)(?<!\1.+)([a-z])(?!.*\2)(?<!\2.+)(.)(\3)(.)(\5) ^ I'm trying to match COFFEE , but not BOBBEE . I'm using java 1.6.
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