Regular expression to match a string and some letters [duplicate]

0

This question already has an answer here:

• 
  Regular Expression to Match String Exactly?
  
  5 answers
  
  

I am trying to find a regular expression for a Flex program that would match a "string " and a sequence of letters that exist in the range [A-E].

What i m trying to do is get the cases that the input has the "string " and either 1 or 2 or 4 or more than 4 letters that exist in the range [A-E].**<

What i have tried so far is the regular expression: "string "([A-E]{1,2}|[A-E]{4,})
The case that the letters are in the range {4,} obviously works however the case {1,2} doesn't since if the user gives into the input "string "ABC it will invoke the case [A-E]{1,2}.

I thought about using a regular expression with a NOT operator something along the lines of : "string "(NOT OPERATOR)([A-E]{3}) so that i would be getting every case that the "string " is followed by anything else that 3 letters, but it turns out there is not such operator.

What can i do to solve this problem?

Thanks in advance for any answer given!

regex

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edited Jan 2 at 19:22

Aaron_ab

1,26421224

asked Jan 2 at 19:13

dimpapdimpap

124

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Jan 2 at 20:20

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Looks like "string "([A-E]{1,2}|[A-E]{4,})b might work.
  
  – Wiktor Stribiżew
  Jan 2 at 19:17
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What about this string "string "ABZ should it match or not? If it should not, then boundary condition will not work.
  
  – Pushpesh Kumar Rajwanshi
  Jan 2 at 19:37
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  All this is part of an excersise and it is assumed that the user wont type any letter other than the ones in range [A-E].So we know that ABZ will never be a given input.
  
  – dimpap
  Jan 2 at 19:54
  

  
  
  
  

add a comment | 

0

This question already has an answer here:

• 
  Regular Expression to Match String Exactly?
  
  5 answers
  
  

I am trying to find a regular expression for a Flex program that would match a "string " and a sequence of letters that exist in the range [A-E].

What i m trying to do is get the cases that the input has the "string " and either 1 or 2 or 4 or more than 4 letters that exist in the range [A-E].**<

What i have tried so far is the regular expression: "string "([A-E]{1,2}|[A-E]{4,})
The case that the letters are in the range {4,} obviously works however the case {1,2} doesn't since if the user gives into the input "string "ABC it will invoke the case [A-E]{1,2}.

I thought about using a regular expression with a NOT operator something along the lines of : "string "(NOT OPERATOR)([A-E]{3}) so that i would be getting every case that the "string " is followed by anything else that 3 letters, but it turns out there is not such operator.

What can i do to solve this problem?

Thanks in advance for any answer given!

regex

share|improve this question

edited Jan 2 at 19:22

Aaron_ab

1,26421224

asked Jan 2 at 19:13

dimpapdimpap

124

marked as duplicate by Wiktor Stribiżew regex
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Jan 2 at 20:20

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Looks like "string "([A-E]{1,2}|[A-E]{4,})b might work.
  
  – Wiktor Stribiżew
  Jan 2 at 19:17
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What about this string "string "ABZ should it match or not? If it should not, then boundary condition will not work.
  
  – Pushpesh Kumar Rajwanshi
  Jan 2 at 19:37
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  All this is part of an excersise and it is assumed that the user wont type any letter other than the ones in range [A-E].So we know that ABZ will never be a given input.
  
  – dimpap
  Jan 2 at 19:54
  

  
  
  
  

add a comment | 

0

0

0

This question already has an answer here:

• 
  Regular Expression to Match String Exactly?
  
  5 answers
  
  

I am trying to find a regular expression for a Flex program that would match a "string " and a sequence of letters that exist in the range [A-E].

What i m trying to do is get the cases that the input has the "string " and either 1 or 2 or 4 or more than 4 letters that exist in the range [A-E].**<

What i have tried so far is the regular expression: "string "([A-E]{1,2}|[A-E]{4,})
The case that the letters are in the range {4,} obviously works however the case {1,2} doesn't since if the user gives into the input "string "ABC it will invoke the case [A-E]{1,2}.

I thought about using a regular expression with a NOT operator something along the lines of : "string "(NOT OPERATOR)([A-E]{3}) so that i would be getting every case that the "string " is followed by anything else that 3 letters, but it turns out there is not such operator.

What can i do to solve this problem?

Thanks in advance for any answer given!

regex

share|improve this question

edited Jan 2 at 19:22

Aaron_ab

1,26421224

asked Jan 2 at 19:13

dimpapdimpap

124

This question already has an answer here:

• 
  Regular Expression to Match String Exactly?
  
  5 answers
  
  

I am trying to find a regular expression for a Flex program that would match a "string " and a sequence of letters that exist in the range [A-E].

What i m trying to do is get the cases that the input has the "string " and either 1 or 2 or 4 or more than 4 letters that exist in the range [A-E].**<

What i have tried so far is the regular expression: "string "([A-E]{1,2}|[A-E]{4,})
The case that the letters are in the range {4,} obviously works however the case {1,2} doesn't since if the user gives into the input "string "ABC it will invoke the case [A-E]{1,2}.

I thought about using a regular expression with a NOT operator something along the lines of : "string "(NOT OPERATOR)([A-E]{3}) so that i would be getting every case that the "string " is followed by anything else that 3 letters, but it turns out there is not such operator.

What can i do to solve this problem?

Thanks in advance for any answer given!

This question already has an answer here:

• 
  Regular Expression to Match String Exactly?
  
  5 answers
  
  

regex

regex

share|improve this question

edited Jan 2 at 19:22

Aaron_ab

1,26421224

asked Jan 2 at 19:13

dimpapdimpap

124

share|improve this question

edited Jan 2 at 19:22

Aaron_ab

1,26421224

asked Jan 2 at 19:13

dimpapdimpap

124

share|improve this question

share|improve this question

edited Jan 2 at 19:22

Aaron_ab

1,26421224

edited Jan 2 at 19:22

Aaron_ab

1,26421224

edited Jan 2 at 19:22

Aaron_ab

1,26421224

1,26421224

asked Jan 2 at 19:13

dimpapdimpap

124

asked Jan 2 at 19:13

dimpapdimpap

124

asked Jan 2 at 19:13

dimpapdimpap

124

124

marked as duplicate by Wiktor Stribiżew regex
Users with the  regex badge can single-handedly close regex questions as duplicates and reopen them as needed.

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Jan 2 at 20:20

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

marked as duplicate by Wiktor Stribiżew regex
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Jan 2 at 20:20

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Looks like "string "([A-E]{1,2}|[A-E]{4,})b might work.
  
  – Wiktor Stribiżew
  Jan 2 at 19:17
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What about this string "string "ABZ should it match or not? If it should not, then boundary condition will not work.
  
  – Pushpesh Kumar Rajwanshi
  Jan 2 at 19:37
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  All this is part of an excersise and it is assumed that the user wont type any letter other than the ones in range [A-E].So we know that ABZ will never be a given input.
  
  – dimpap
  Jan 2 at 19:54
  

  
  
  
  

add a comment | 

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Looks like "string "([A-E]{1,2}|[A-E]{4,})b might work.
  
  – Wiktor Stribiżew
  Jan 2 at 19:17
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What about this string "string "ABZ should it match or not? If it should not, then boundary condition will not work.
  
  – Pushpesh Kumar Rajwanshi
  Jan 2 at 19:37
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  All this is part of an excersise and it is assumed that the user wont type any letter other than the ones in range [A-E].So we know that ABZ will never be a given input.
  
  – dimpap
  Jan 2 at 19:54
  

  
  
  
  

1

1

Looks like "string "([A-E]{1,2}|[A-E]{4,})b might work.

– Wiktor Stribiżew
Jan 2 at 19:17

Looks like "string "([A-E]{1,2}|[A-E]{4,})b might work.

– Wiktor Stribiżew
Jan 2 at 19:17

What about this string "string "ABZ should it match or not? If it should not, then boundary condition will not work.

– Pushpesh Kumar Rajwanshi
Jan 2 at 19:37

What about this string "string "ABZ should it match or not? If it should not, then boundary condition will not work.

– Pushpesh Kumar Rajwanshi
Jan 2 at 19:37

All this is part of an excersise and it is assumed that the user wont type any letter other than the ones in range [A-E].So we know that ABZ will never be a given input.

– dimpap
Jan 2 at 19:54

All this is part of an excersise and it is assumed that the user wont type any letter other than the ones in range [A-E].So we know that ABZ will never be a given input.

– dimpap
Jan 2 at 19:54

add a comment | 

2 Answers
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Yes, the string "ABC" matches [A-E]{1,2} because you don't insist that those letters are the only thing in the specified string (hence, "AB" matches and "C" just gets lumped in there for some other reason). You should insist that when the regex is done, you've reached the end of the line/string:

^string ([A-E]{1,2}|[A-E]{4})$

or at least some sort of word boundary:

string ([A-E]{1,2}|[A-E]{4})b

share|improve this answer

answered Jan 2 at 19:22

scnerdscnerd

3,41411126

add a comment | 

0

Your regex is almost fine, just enforce the next letter to be not in your group, to prevent the ABC problem:

"string "([A-E]{1,2}|[A-E]{4,})[^A-E]

If this is the end of the string, you need to check for that as well:

"string "([A-E]{1,2}|[A-E]{4,})([^A-E]|$)

share|improve this answer

answered Jan 2 at 19:16

kabanuskabanus

12.4k31542

add a comment | 

2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

active

oldest

votes

active

oldest

votes

0

Yes, the string "ABC" matches [A-E]{1,2} because you don't insist that those letters are the only thing in the specified string (hence, "AB" matches and "C" just gets lumped in there for some other reason). You should insist that when the regex is done, you've reached the end of the line/string:

^string ([A-E]{1,2}|[A-E]{4})$

or at least some sort of word boundary:

string ([A-E]{1,2}|[A-E]{4})b

share|improve this answer

answered Jan 2 at 19:22

scnerdscnerd

3,41411126

add a comment | 

0

Yes, the string "ABC" matches [A-E]{1,2} because you don't insist that those letters are the only thing in the specified string (hence, "AB" matches and "C" just gets lumped in there for some other reason). You should insist that when the regex is done, you've reached the end of the line/string:

^string ([A-E]{1,2}|[A-E]{4})$

or at least some sort of word boundary:

string ([A-E]{1,2}|[A-E]{4})b

share|improve this answer

answered Jan 2 at 19:22

scnerdscnerd

3,41411126

add a comment | 

0

0

0

Yes, the string "ABC" matches [A-E]{1,2} because you don't insist that those letters are the only thing in the specified string (hence, "AB" matches and "C" just gets lumped in there for some other reason). You should insist that when the regex is done, you've reached the end of the line/string:

^string ([A-E]{1,2}|[A-E]{4})$

or at least some sort of word boundary:

string ([A-E]{1,2}|[A-E]{4})b

share|improve this answer

answered Jan 2 at 19:22

scnerdscnerd

3,41411126

Yes, the string "ABC" matches [A-E]{1,2} because you don't insist that those letters are the only thing in the specified string (hence, "AB" matches and "C" just gets lumped in there for some other reason). You should insist that when the regex is done, you've reached the end of the line/string:

^string ([A-E]{1,2}|[A-E]{4})$

or at least some sort of word boundary:

string ([A-E]{1,2}|[A-E]{4})b

share|improve this answer

answered Jan 2 at 19:22

scnerdscnerd

3,41411126

share|improve this answer

share|improve this answer

answered Jan 2 at 19:22

scnerdscnerd

3,41411126

answered Jan 2 at 19:22

scnerdscnerd

3,41411126

answered Jan 2 at 19:22

scnerdscnerd

3,41411126

3,41411126

add a comment | 

add a comment | 

0

Your regex is almost fine, just enforce the next letter to be not in your group, to prevent the ABC problem:

"string "([A-E]{1,2}|[A-E]{4,})[^A-E]

If this is the end of the string, you need to check for that as well:

"string "([A-E]{1,2}|[A-E]{4,})([^A-E]|$)

share|improve this answer

answered Jan 2 at 19:16

kabanuskabanus

12.4k31542

add a comment | 

0

Your regex is almost fine, just enforce the next letter to be not in your group, to prevent the ABC problem:

"string "([A-E]{1,2}|[A-E]{4,})[^A-E]

If this is the end of the string, you need to check for that as well:

"string "([A-E]{1,2}|[A-E]{4,})([^A-E]|$)

share|improve this answer

answered Jan 2 at 19:16

kabanuskabanus

12.4k31542

add a comment | 

0

0

0

Your regex is almost fine, just enforce the next letter to be not in your group, to prevent the ABC problem:

"string "([A-E]{1,2}|[A-E]{4,})[^A-E]

If this is the end of the string, you need to check for that as well:

"string "([A-E]{1,2}|[A-E]{4,})([^A-E]|$)

share|improve this answer

answered Jan 2 at 19:16

kabanuskabanus

12.4k31542

Your regex is almost fine, just enforce the next letter to be not in your group, to prevent the ABC problem:

"string "([A-E]{1,2}|[A-E]{4,})[^A-E]

If this is the end of the string, you need to check for that as well:

"string "([A-E]{1,2}|[A-E]{4,})([^A-E]|$)

share|improve this answer

answered Jan 2 at 19:16

kabanuskabanus

12.4k31542

share|improve this answer

share|improve this answer

answered Jan 2 at 19:16

kabanuskabanus

12.4k31542

answered Jan 2 at 19:16

kabanuskabanus

12.4k31542

answered Jan 2 at 19:16

kabanuskabanus

12.4k31542

12.4k31542

add a comment | 

add a comment | 

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