Construct a regular expression
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The problem asks me to construct a regular expression for the set of strings in {a,b}* that have even number of a and b.
What I have tried is (aa)* + (bb)* + (aabb)* but I believe it does not cover a string like abbbaaba.
Many thanks,
discrete-mathematics regular-expressions
asked Nov 20 at 1:04
Alan Bui
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up vote
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down vote
favorite
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The problem asks me to construct a regular expression for the set of strings in {a,b}* that have even number of a and b.
What I have tried is (aa)* + (bb)* + (aabb)* but I believe it does not cover a string like abbbaaba.
Many thanks,
discrete-mathematics regular-expressions
asked Nov 20 at 1:04
Alan Bui
113
New contributor
Alan Bui is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Where the $*$ in the post refers to a Kleene star for a finite alphabet: $A^* =cup_{n=1}^infty A^n$ ?
– Mason
Nov 20 at 1:14
Can you be more simple please, I am quite new to this :)
– Alan Bui
Nov 20 at 1:17
I have done anything yet. You use a $*$ in your post. What does it mean? It must mean kleene star?
– Mason
Nov 20 at 1:19
@Mason yes it is
– Alan Bui
Nov 20 at 1:21
1
Are you familiar with the procedure, given a deterministic finite state machine, to find a corresponding regular expression? If so, that's probably the approach I'd take - first, construct the state machine with states $EE,EO,OE,OO$ and then find the corresponding regular expression.
– Daniel Schepler
Nov 20 at 1:22
|
show 1 more comment
up vote
2
down vote
favorite
3
up vote
2
down vote
favorite
3
3
The problem asks me to construct a regular expression for the set of strings in {a,b}* that have even number of a and b.
What I have tried is (aa)* + (bb)* + (aabb)* but I believe it does not cover a string like abbbaaba.
Many thanks,
discrete-mathematics regular-expressions
asked Nov 20 at 1:04
Alan Bui
113
New contributor
Alan Bui is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
The problem asks me to construct a regular expression for the set of strings in {a,b}* that have even number of a and b.
What I have tried is (aa)* + (bb)* + (aabb)* but I believe it does not cover a string like abbbaaba.
Many thanks,
discrete-mathematics regular-expressions
discrete-mathematics regular-expressions
asked Nov 20 at 1:04
Alan Bui
113
New contributor
Alan Bui is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Nov 20 at 1:04
Alan Bui
113
New contributor
Alan Bui is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Nov 20 at 1:04
Alan Bui
113
New contributor
Alan Bui is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Nov 20 at 1:04
Alan Bui
113
asked Nov 20 at 1:04
Alan Bui
113
113
New contributor
Alan Bui is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Alan Bui is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Alan Bui is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Where the $*$ in the post refers to a Kleene star for a finite alphabet: $A^* =cup_{n=1}^infty A^n$ ?
– Mason
Nov 20 at 1:14
Can you be more simple please, I am quite new to this :)
– Alan Bui
Nov 20 at 1:17
I have done anything yet. You use a $*$ in your post. What does it mean? It must mean kleene star?
– Mason
Nov 20 at 1:19
@Mason yes it is
– Alan Bui
Nov 20 at 1:21
1
Are you familiar with the procedure, given a deterministic finite state machine, to find a corresponding regular expression? If so, that's probably the approach I'd take - first, construct the state machine with states $EE,EO,OE,OO$ and then find the corresponding regular expression.
– Daniel Schepler
Nov 20 at 1:22
|
show 1 more comment
Where the $*$ in the post refers to a Kleene star for a finite alphabet: $A^* =cup_{n=1}^infty A^n$ ?
– Mason
Nov 20 at 1:14
Can you be more simple please, I am quite new to this :)
– Alan Bui
Nov 20 at 1:17
I have done anything yet. You use a $*$ in your post. What does it mean? It must mean kleene star?
– Mason
Nov 20 at 1:19
@Mason yes it is
– Alan Bui
Nov 20 at 1:21
1
Are you familiar with the procedure, given a deterministic finite state machine, to find a corresponding regular expression? If so, that's probably the approach I'd take - first, construct the state machine with states $EE,EO,OE,OO$ and then find the corresponding regular expression.
– Daniel Schepler
Nov 20 at 1:22
Where the $*$ in the post refers to a Kleene star for a finite alphabet: $A^* =cup_{n=1}^infty A^n$ ?
– Mason
Nov 20 at 1:14
Where the $*$ in the post refers to a Kleene star for a finite alphabet: $A^* =cup_{n=1}^infty A^n$ ?
– Mason
Nov 20 at 1:14
Can you be more simple please, I am quite new to this :)
– Alan Bui
Nov 20 at 1:17
Can you be more simple please, I am quite new to this :)
– Alan Bui
Nov 20 at 1:17
I have done anything yet. You use a $*$ in your post. What does it mean? It must mean kleene star?
– Mason
Nov 20 at 1:19
I have done anything yet. You use a $*$ in your post. What does it mean? It must mean kleene star?
– Mason
Nov 20 at 1:19
@Mason yes it is
– Alan Bui
Nov 20 at 1:21
@Mason yes it is
– Alan Bui
Nov 20 at 1:21
1
1
Are you familiar with the procedure, given a deterministic finite state machine, to find a corresponding regular expression? If so, that's probably the approach I'd take - first, construct the state machine with states $EE,EO,OE,OO$ and then find the corresponding regular expression.
– Daniel Schepler
Nov 20 at 1:22
Are you familiar with the procedure, given a deterministic finite state machine, to find a corresponding regular expression? If so, that's probably the approach I'd take - first, construct the state machine with states $EE,EO,OE,OO$ and then find the corresponding regular expression.
– Daniel Schepler
Nov 20 at 1:22
|
show 1 more comment
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Where the $*$ in the post refers to a Kleene star for a finite alphabet: $A^* =cup_{n=1}^infty A^n$ ?
– Mason
Nov 20 at 1:14
Can you be more simple please, I am quite new to this :)
– Alan Bui
Nov 20 at 1:17
I have done anything yet. You use a $*$ in your post. What does it mean? It must mean kleene star?
– Mason
Nov 20 at 1:19
@Mason yes it is
– Alan Bui
Nov 20 at 1:21
1
Are you familiar with the procedure, given a deterministic finite state machine, to find a corresponding regular expression? If so, that's probably the approach I'd take - first, construct the state machine with states $EE,EO,OE,OO$ and then find the corresponding regular expression.
– Daniel Schepler
Nov 20 at 1:22