Write a regular expression for binary strings with at least two 0s but not consecutive 0s. 1*01+01*

Write a regular expression that matches all strings over the alphabet {a, b, c} that contain: Starts and ends with a
a(a*b*c*)a /( a / a(a/b)*a)
At most one a
b*c*/b*c* a b*c*
At least two a's
b*c* a b*c* a b*c*
An even number of a's
(b*c* a b*c* a b*c*)+
Number of a's plus number of b's is even

Write a regular expression to describe all dates of the form Month DD, YYYY, where Month consists of any string of upper or lower case letters, the date is 1 or 2 digits, and the year is exactly 4 digits. The comma and spaces are required.

Write a regular expression for each of the following:
Strings over the alphabet {a, b, c} where the first a precedes the first b. c*a[ac]*b[abc]*
Strings over the alphabets {a, b, c} with an even number of a’s. (b*c* a b*c* a b*c*)+ / (aa/b/c)*
Binary numbers that are multiples of four.
( 1/0 1/0 1/0 1/0)* / (0*[01]*00 | 0+)
Binary numbers that are greater than 101001.
Strings over the alphabet {a, b, c} thar don’t contain the contiguous substring baa. ([ac]*b(c/a[^a])[ac]*b*)+/[ac]+

Identify the lexeme that makes up the tokens in the following programs. Give reasonable attribute vcalues for the tokens. Pascal
Function max ( i, j : integer) : integer ; {
return maximium of integers i and j }
begin
if i > j then max := i
else max := j
end;
C
Int max ( i, j) int i, j;
/* return maximium of integers I and j */
{ return i > j? i:j; }

Draw the Transition Diagram for relational operators.

...
REGULAREXPRESSIONS AND IT’S APPLICATIONS
REGULAREXPRESSIONS
A regularexpression is a specific pattern that provides concise and flexible means to "match" (specify and recognize) strings of text, such as particular characters, words, or patterns of characters. Common abbreviations for "regularexpression” include regex and regexp. It is a...

...RegularExpressions
This ppt is the work by Dr. Costas Busch, used with permission, and
available from
http://csc.lsu.edu/~busch/courses/theorycomp/fall2008/
1
RegularExpressionsRegularexpressions
describe regular languages
Example:
(a b c) *
describes the language
a, bc * , a, bc, aa, abc, bca,...
2
Recursive Definition
Primitive regular...

...CS 3133 Foundations of Computer Science
C term 2014
Solutions of the Sample Problems for the Midterm
Exam
1. Give a regularexpression that represents the set of strings over Σ =
{a, b} that contain the substring ab and the substring ba.
Solution:
a+ b+ a(a ∪ b)∗ ∪ b+ a+ b(a ∪ b)∗
(20 points)
2. Consider the following grammar G:
S → SAB|λ
A → aA|a
B → bB|λ
(a) Give a leftmost derivation of abbaab.
(b) Build the derivation tree for the derivation in...

...Automata and RegularExpressions
Finite Automata Recognize Regular Languages Theorem 1. L is a regular language iﬀ there is a regularexpression R such that L(R) = L iﬀ there is a DFA M such that L(M ) = L iﬀ there is a NFA N such that L(N ) = L. i.e., regularexpressions, DFAs and NFAs have the same computational power. Proof. • Given regular...

...Implementations of:
Finite automata
Regularexpression
Pushdown automata
Engineering applications of finite automata
The study of automata has been acquiring increasing importance for engineers in many fields. For some time, the capabilities of these automata have been of the greatest interest to logicians and mathematicians. However, the expanding literature on the use of finite automata as...

...edu/~busch/courses/theorycomp/fall2008/
1
The Pumping Lemma:
• Given a infinite regular language
L
• there exists an integerm
| w | m
with length
• for any string w L
• we can write w x
• with
|x y| m
• such that:
Fall 2006
(critical length
yz
and |
i
xy z L
Costas Busch - RPI
y | 1
i 0, 1, 2, ...
2
Non-regular languages
R
L {vv : v *}
Regular languages
Fall 2006
Costas Busch - RPI
3
Theorem:The language
R
L {vv :...

...
Artistic Expression in “The Storyteller’s Daughter”
Erin Lowry
Instructor: Cynthia Williams
ENG317: International Voices
November 3, 2014
Artistic Expression is a way in which an artist, whether writer, painter, musician, or even just a regular person expresses themselves through art and imagination. We have all long read stories or heard songs that come from someone’s heart and maybe imagination. But what we don’t realize when we...

...______ / ______
Algebra I Quarter 1 Exam
Answer the questions below. Make sure to show your work when applicable.
Solve the absolute value equation. Check your solutions.
| 5x + 13| = –7
5x + 13 = -7
5x = -20
X = -4
Simplify the expression below.
6n2 - 5n2 + 7n2
6 – 5 + 7 = 8
=8n2
The total cost for 8 bracelets, including shipping was $54. The shipping charge was $6. Write an equation that models the cost of each bracelet.
8 x + 6 = 54 $8.00...