How would I find the language for the following regular expressions over the alphabet {a, b}? aUb* (ab*Uc)
I know how ea开发者_JAVA百科ch of them can be converted to one another but never really understood what their applications are. The usual infix operation is quite readable, but where does it fail whic
Before anything, yes, this is from coursework and I\'ve been at it sporadically while dealing with another project.
I wrote the following program to check strings for balanced parenthesis: isBalanced xs = isBalanced\' xs []
开发者_开发问答I would like to determirmine if a word is in a large list of keywords (vulgar and so on) and a parser should be a good solution (it should be fast as far as I know) because I need a few
1, I have an NFA that can recognize two words, \"aa\" and \"epsilon\". So the language L1 this NFA recognizes is a set {aa, epsilon}.
Is the following language L undecidable? L = {M | M is a Turing machine description and there exists an input x of length k such that M halts after at most k steps}
I do need your help. I have these productions: 1) A--> aAb 2) A--> bAa 3) A--> ε I should apply the Chomsky Normal Form (CNF).
Problem 19.5 of Sudkamp\'s Languages and Machines asks the reader to verify that the grammar G : S\' -> S##
Is there NOT logic in ANTLR? Im basically trying to negate a rule that i have and was wondering if its possible, also is there开发者_StackOverflow社区 AND logic? @larsmans already supplied the answer,
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