Regex for bit string containing at least 2 zeros but no consecutive zeros.
This is what I have:
(1*011*011*)*
But I don't think this is accounting for an odd number of zeros, like "10101010101111". I think I have the right expression that satisfies no 2 consecutive zeros and even number of zeros.
regular-expressions
asked Dec 3 '18 at 19:19
pinklemonadepinklemonade
827
add a comment |
This is what I have:
(1*011*011*)*
But I don't think this is accounting for an odd number of zeros, like "10101010101111". I think I have the right expression that satisfies no 2 consecutive zeros and even number of zeros.
regular-expressions
asked Dec 3 '18 at 19:19
pinklemonadepinklemonade
827
add a comment |
This is what I have:
(1*011*011*)*
But I don't think this is accounting for an odd number of zeros, like "10101010101111". I think I have the right expression that satisfies no 2 consecutive zeros and even number of zeros.
regular-expressions
asked Dec 3 '18 at 19:19
pinklemonadepinklemonade
827
This is what I have:
(1*011*011*)*
But I don't think this is accounting for an odd number of zeros, like "10101010101111". I think I have the right expression that satisfies no 2 consecutive zeros and even number of zeros.
regular-expressions
regular-expressions
asked Dec 3 '18 at 19:19
pinklemonadepinklemonade
827
asked Dec 3 '18 at 19:19
pinklemonadepinklemonade
827
asked Dec 3 '18 at 19:19
pinklemonadepinklemonade
827
asked Dec 3 '18 at 19:19
pinklemonadepinklemonade
827
asked Dec 3 '18 at 19:19
pinklemonadepinklemonade
827
827
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
I'll get you started.
You need to have two zeroes, so start by putting those in your regex, leaving space between, before and after:
$$
______0______0______
$$
Now, consider the space on the left. Every zero in this region is followed by a $1$. Therefore, this portion can be broken into sums of $(01)$ and $1$, so it is $(01|1)^*$:
$$
(01|1)^*0______0______
$$
What about the space in the middle? It has similar rules, but we cannot quite use the same regex $(01|1)^*$ we used on the left. The problem is that this can begin with a zero, which would cause a $00$ with the first $0$ we placed. How can you fix this?
answered Dec 3 '18 at 21:07
Mike EarnestMike Earnest
20.7k11950
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
I'll get you started.
You need to have two zeroes, so start by putting those in your regex, leaving space between, before and after:
$$
______0______0______
$$
Now, consider the space on the left. Every zero in this region is followed by a $1$. Therefore, this portion can be broken into sums of $(01)$ and $1$, so it is $(01|1)^*$:
$$
(01|1)^*0______0______
$$
What about the space in the middle? It has similar rules, but we cannot quite use the same regex $(01|1)^*$ we used on the left. The problem is that this can begin with a zero, which would cause a $00$ with the first $0$ we placed. How can you fix this?
answered Dec 3 '18 at 21:07
Mike EarnestMike Earnest
20.7k11950
add a comment |
I'll get you started.
You need to have two zeroes, so start by putting those in your regex, leaving space between, before and after:
$$
______0______0______
$$
Now, consider the space on the left. Every zero in this region is followed by a $1$. Therefore, this portion can be broken into sums of $(01)$ and $1$, so it is $(01|1)^*$:
$$
(01|1)^*0______0______
$$
What about the space in the middle? It has similar rules, but we cannot quite use the same regex $(01|1)^*$ we used on the left. The problem is that this can begin with a zero, which would cause a $00$ with the first $0$ we placed. How can you fix this?
answered Dec 3 '18 at 21:07
Mike EarnestMike Earnest
20.7k11950
add a comment |
I'll get you started.
You need to have two zeroes, so start by putting those in your regex, leaving space between, before and after:
$$
______0______0______
$$
Now, consider the space on the left. Every zero in this region is followed by a $1$. Therefore, this portion can be broken into sums of $(01)$ and $1$, so it is $(01|1)^*$:
$$
(01|1)^*0______0______
$$
What about the space in the middle? It has similar rules, but we cannot quite use the same regex $(01|1)^*$ we used on the left. The problem is that this can begin with a zero, which would cause a $00$ with the first $0$ we placed. How can you fix this?
answered Dec 3 '18 at 21:07
Mike EarnestMike Earnest
20.7k11950
I'll get you started.
You need to have two zeroes, so start by putting those in your regex, leaving space between, before and after:
$$
______0______0______
$$
Now, consider the space on the left. Every zero in this region is followed by a $1$. Therefore, this portion can be broken into sums of $(01)$ and $1$, so it is $(01|1)^*$:
$$
(01|1)^*0______0______
$$
What about the space in the middle? It has similar rules, but we cannot quite use the same regex $(01|1)^*$ we used on the left. The problem is that this can begin with a zero, which would cause a $00$ with the first $0$ we placed. How can you fix this?
answered Dec 3 '18 at 21:07
Mike EarnestMike Earnest
20.7k11950
answered Dec 3 '18 at 21:07
Mike EarnestMike Earnest
20.7k11950
answered Dec 3 '18 at 21:07
Mike EarnestMike Earnest
20.7k11950
answered Dec 3 '18 at 21:07
Mike EarnestMike Earnest
20.7k11950
20.7k11950
add a comment |
add a comment |
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