Homework Answers
1. All strings that begin with 1 and end with 2
Regular expression = 1(0 + 1 + 2)* 2
2. All strings that exactly three 1's
R.E = (0 + 2)* 1(0 + 2)* 1(0 + 2)* 1(0 + 2)*
3. All strings in which the digits are non-decreasing
R.E = 0* 1* 2*
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Programming Languages Final Exam Name: Question 1 (15 points) Give a regular expression for each of...
Give a regular expression that generates C In certain programming languages, comments appear between delimiters such...
Give a regular expression that generates C
In certain programming languages, comments appear between delimiters such as /# and #. Let C be the language of all valid delimited comment strings. A mem- ber of C must begin with /# and end with #/ but have no intervening #. For simplicity, assume that the alphabet for Cis Σ {a, b, /
Give a regular expression for these languages i) {w| w is a word of the alphabet...
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Regular expressions, DFA, NFA, grammars, languages Regular Languages 4 4 1. Write English descriptions for the...
Regular expressions, DFA, NFA, grammars, languages
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3) Construct a regular expression defining each of the following languages over the alphabet {a, b}....
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For each of the languages listed below, give a regular expression that generates the lan- guage....
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Question 1 - Regular Expressions Find regular expressions that define the following languages: 1. All even-length...
Question 1 - Regular Expressions Find regular expressions that define the following languages: 1. All even-length strings over the alphabet {a,b}. 2. All strings over the alphabet {a,b} with odd numbers of a's. 3. All strings over the alphabet {a,b} with even numbers of b’s. 4. All strings over the alphabet {a,b} that start and end with different symbols. 5. All strings over the alphabet {a, b} that do not contain the substring aab and end with bb.
(a) Give 2 strings that are members of language specified by the regular expression (0+ 1)∗...
(a) Give 2 strings that are members of language specified by the regular expression (0+ 1)∗ but are not members of the language specified by 0∗ + 1∗ . Then give 2 strings that are members of both languages. Assume the alphabet is Σ = {0, 1}. (b) For each of the following languages specified by regular expressions, give 2 strings that are members and 2 strings that are not members (a total of 4 strings for each part). Assume...
given ∑ = {a,b}: 1. describe in English the languages denoted by the regular expression: (a+b)*b(a+b)*...
given ∑ = {a,b}: 1. describe in English the languages denoted by the regular expression: (a+b)*b(a+b)* 2. Write a regular expression: L(w) = {w | w has exactly a single substring abaa or exactly a single substring babb} 3. Write a regular expression for the following language: L(w) = {w | w ends in bb and does contain the substring aba}
Give regular expressions for the following languages: (a) The language of all strings over {a,b} except...
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Give a regular expression that generates C
In certain programming languages, comments appear between delimiters such as /# and #. Let C be the language of all valid delimited comment strings. A mem- ber of C must begin with /# and end with #/ but have no intervening #. For simplicity, assume that the alphabet for Cis Σ {a, b, /
Regular expressions, DFA, NFA, grammars, languages
Regular Languages 4 4 1. Write English descriptions for the languages generated by the following regular expressions: (a) (01... 9|A|B|C|D|E|F)+(2X) (b) (ab)*(a|ble) 2. Write regular expressions for each of the following. (a) All strings of lowercase letters that begin and end in a. (b) All strings of digits that contain no leading zeros. (c) All strings of digits that represent even numbers. (d) Strings over the alphabet {a,b,c} with an even number of a's....
For each of the languages listed below, give a regular expression that generates the lan- guage. Briefly justify your answer. (a) The set of strings over (a, b such that any a in the string is followed by an odd number of b's. Examples: bbbab E L, but abb f L. (b) The set of strings over fa, b in which there is an a in every even position and the total number of b's is odd, where the first...
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(4 points.) Consider the regular expression (11 + 00)'1(e + 01). . Give two strings of O's and 1's, each 6 to 12 characters long, that are both represented by this regular expression . Construct a nondeterministic finite automaton equivalent to the regular expression.
(4 points.) Consider the regular expression (11 + 00)'1(e + 01). . Give two strings of O's and 1's, each 6 to 12 characters long, that are both represented by this regular expression . Construct a...
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