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Note that with negation and union you also have by applying DeMorgan intersection and set difference: The decimal integer n must be positive. Both n and m are non-negative decimal integers and m must not be smaller than n.
The preceding line terminator in the input is not consumed and can be matched by another rule. In a lexical rule, a regular expression r may be followed by a look-ahead expression.
In both cases the look-ahead is not consumed and not included in the matched text region, but it is considered while determining which rule has the longest match see also How the input is matched. This is different to the situation described in Davis and Heninger For arbitrary look-ahead also called trailing context the expression is matched only when followed by input that matches the trailing context.
The action code will only be executed when the end of file is read and the scanner is currently in one of the lexical states listed in StateList. An Action consists either of a piece of Java code enclosed in curly braces or is the special action. The action is an abbreviation for the action of the following expression.
If there is more than one regular expression that matches the longest portion of input i. After determining the active regular expression, the associated action is executed.
Lexical states can be used to further restrict the set of regular expressions that match the current input. A regular expression can only be matched when its associated set of lexical states includes the currently active lexical state of the scanner or if the set of associated lexical states is empty and the currently active lexical state is inclusive.
Exclusive and inclusive states only differ in this one point: The currently active lexical state of the scanner can be changed from within an action of a regular expression using the method yybegin. The set of lexical states associated with a regular expression is the StateList that precedes the expression.
If a rule is contained in one or more StateGroups, then the states of these are also associated with the rule, i. The rule with expr1 has no states listed, and is thus matched in all states but the exclusive ones, i.
In its action, the scanner is switched to state A. The rule expr3 can only be matched in state A and expr4 in states A, B, and C.
Lexical states are declared and used as Java int constants in the generated class under the same name as they are used in the specification.NFL Draft predictions including pick-by-pick analysis from CBS Sports NFL experts.
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