Validating querystring


11-Jan-2021 09:29

So, this would be the prerequisites: without repeating match groups or catastrophic back tracking? Edit: I'd like to clarify that this is not meant for a real-world implementation; for that, the built-in library in your language, which is most likely available should be used.

This question is asked because I want to improve my regex skills, and parsing a query string seemed like a rewarding challenge.

I know it's because of the % sign, so how do I translate this thru, so that the following page picks up the percent sign?

*** Sent via Developersdex I am passing a sql string thru my querystring for the next page to capture. str=select * from table where name like '%doe%' Passing a basic string works fine.

If keys need to be hyphen free: NODE EXPLANATION -------------------------------------------------------------------------------- ^ the beginning of the string -------------------------------------------------------------------------------- \? ' -------------------------------------------------------------------------------- ( group and capture to

So, this would be the prerequisites: without repeating match groups or catastrophic back tracking? Edit: I'd like to clarify that this is not meant for a real-world implementation; for that, the built-in library in your language, which is most likely available should be used.This question is asked because I want to improve my regex skills, and parsing a query string seemed like a rewarding challenge.I know it's because of the % sign, so how do I translate this thru, so that the following page picks up the percent sign?*** Sent via Developersdex I am passing a sql string thru my querystring for the next page to capture. str=select * from table where name like '%doe%' Passing a basic string works fine.If keys need to be hyphen free: NODE EXPLANATION -------------------------------------------------------------------------------- ^ the beginning of the string -------------------------------------------------------------------------------- \? ' -------------------------------------------------------------------------------- ( group and capture to \1 (1 or more times (matching the most amount possible)): -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- = '=' -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- & '&' -------------------------------------------------------------------------------- ) end of \1 (NOTE: because you are using a quantifier on this capture, only the LAST repetition of the captured pattern will be stored in \1) -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- ( group and capture to \2 (optional (matching the most amount possible)): -------------------------------------------------------------------------------- = '=' -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- )?end of \2 (NOTE: because you are using a quantifier on this capture, only the LAST repetition of the captured pattern will be stored in \2) -------------------------------------------------------------------------------- $ before an optional \n, and the end of the string This might not be a job for regexes, but for existing tools in your language of choice.

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So, this would be the prerequisites: without repeating match groups or catastrophic back tracking? Edit: I'd like to clarify that this is not meant for a real-world implementation; for that, the built-in library in your language, which is most likely available should be used.

This question is asked because I want to improve my regex skills, and parsing a query string seemed like a rewarding challenge.

I know it's because of the % sign, so how do I translate this thru, so that the following page picks up the percent sign?

*** Sent via Developersdex I am passing a sql string thru my querystring for the next page to capture. str=select * from table where name like '%doe%' Passing a basic string works fine.

If keys need to be hyphen free: NODE EXPLANATION -------------------------------------------------------------------------------- ^ the beginning of the string -------------------------------------------------------------------------------- \? ' -------------------------------------------------------------------------------- ( group and capture to \1 (1 or more times (matching the most amount possible)): -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- = '=' -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- & '&' -------------------------------------------------------------------------------- ) end of \1 (NOTE: because you are using a quantifier on this capture, only the LAST repetition of the captured pattern will be stored in \1) -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- ( group and capture to \2 (optional (matching the most amount possible)): -------------------------------------------------------------------------------- = '=' -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- )?

(1 or more times (matching the most amount possible)): -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- = '=' -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- & '&' -------------------------------------------------------------------------------- ) end of

So, this would be the prerequisites: without repeating match groups or catastrophic back tracking? Edit: I'd like to clarify that this is not meant for a real-world implementation; for that, the built-in library in your language, which is most likely available should be used.This question is asked because I want to improve my regex skills, and parsing a query string seemed like a rewarding challenge.I know it's because of the % sign, so how do I translate this thru, so that the following page picks up the percent sign?*** Sent via Developersdex I am passing a sql string thru my querystring for the next page to capture. str=select * from table where name like '%doe%' Passing a basic string works fine.If keys need to be hyphen free: NODE EXPLANATION -------------------------------------------------------------------------------- ^ the beginning of the string -------------------------------------------------------------------------------- \? ' -------------------------------------------------------------------------------- ( group and capture to \1 (1 or more times (matching the most amount possible)): -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- = '=' -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- & '&' -------------------------------------------------------------------------------- ) end of \1 (NOTE: because you are using a quantifier on this capture, only the LAST repetition of the captured pattern will be stored in \1) -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- ( group and capture to \2 (optional (matching the most amount possible)): -------------------------------------------------------------------------------- = '=' -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- )?end of \2 (NOTE: because you are using a quantifier on this capture, only the LAST repetition of the captured pattern will be stored in \2) -------------------------------------------------------------------------------- $ before an optional \n, and the end of the string This might not be a job for regexes, but for existing tools in your language of choice.

||

So, this would be the prerequisites: without repeating match groups or catastrophic back tracking? Edit: I'd like to clarify that this is not meant for a real-world implementation; for that, the built-in library in your language, which is most likely available should be used.

This question is asked because I want to improve my regex skills, and parsing a query string seemed like a rewarding challenge.

I know it's because of the % sign, so how do I translate this thru, so that the following page picks up the percent sign?

*** Sent via Developersdex I am passing a sql string thru my querystring for the next page to capture. str=select * from table where name like '%doe%' Passing a basic string works fine.

If keys need to be hyphen free: NODE EXPLANATION -------------------------------------------------------------------------------- ^ the beginning of the string -------------------------------------------------------------------------------- \? ' -------------------------------------------------------------------------------- ( group and capture to \1 (1 or more times (matching the most amount possible)): -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- = '=' -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- & '&' -------------------------------------------------------------------------------- ) end of \1 (NOTE: because you are using a quantifier on this capture, only the LAST repetition of the captured pattern will be stored in \1) -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- ( group and capture to \2 (optional (matching the most amount possible)): -------------------------------------------------------------------------------- = '=' -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- )?

(NOTE: because you are using a quantifier on this capture, only the LAST repetition of the captured pattern will be stored in

So, this would be the prerequisites: without repeating match groups or catastrophic back tracking? Edit: I'd like to clarify that this is not meant for a real-world implementation; for that, the built-in library in your language, which is most likely available should be used.This question is asked because I want to improve my regex skills, and parsing a query string seemed like a rewarding challenge.I know it's because of the % sign, so how do I translate this thru, so that the following page picks up the percent sign?*** Sent via Developersdex I am passing a sql string thru my querystring for the next page to capture. str=select * from table where name like '%doe%' Passing a basic string works fine.If keys need to be hyphen free: NODE EXPLANATION -------------------------------------------------------------------------------- ^ the beginning of the string -------------------------------------------------------------------------------- \? ' -------------------------------------------------------------------------------- ( group and capture to \1 (1 or more times (matching the most amount possible)): -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- = '=' -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- & '&' -------------------------------------------------------------------------------- ) end of \1 (NOTE: because you are using a quantifier on this capture, only the LAST repetition of the captured pattern will be stored in \1) -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- ( group and capture to \2 (optional (matching the most amount possible)): -------------------------------------------------------------------------------- = '=' -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- )?end of \2 (NOTE: because you are using a quantifier on this capture, only the LAST repetition of the captured pattern will be stored in \2) -------------------------------------------------------------------------------- $ before an optional \n, and the end of the string This might not be a job for regexes, but for existing tools in your language of choice.

||

So, this would be the prerequisites: without repeating match groups or catastrophic back tracking? Edit: I'd like to clarify that this is not meant for a real-world implementation; for that, the built-in library in your language, which is most likely available should be used.

This question is asked because I want to improve my regex skills, and parsing a query string seemed like a rewarding challenge.

I know it's because of the % sign, so how do I translate this thru, so that the following page picks up the percent sign?

*** Sent via Developersdex I am passing a sql string thru my querystring for the next page to capture. str=select * from table where name like '%doe%' Passing a basic string works fine.

If keys need to be hyphen free: NODE EXPLANATION -------------------------------------------------------------------------------- ^ the beginning of the string -------------------------------------------------------------------------------- \? ' -------------------------------------------------------------------------------- ( group and capture to \1 (1 or more times (matching the most amount possible)): -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- = '=' -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- & '&' -------------------------------------------------------------------------------- ) end of \1 (NOTE: because you are using a quantifier on this capture, only the LAST repetition of the captured pattern will be stored in \1) -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- ( group and capture to \2 (optional (matching the most amount possible)): -------------------------------------------------------------------------------- = '=' -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- )?

) -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- ( group and capture to (optional (matching the most amount possible)): -------------------------------------------------------------------------------- = '=' -------------------------------------------------------------------------------- [^=] any character except: '=' (1 or more times (matching the most amount possible)) -------------------------------------------------------------------------------- )?

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What I do is have a sortby in the querystring, which matches the column names... mysql="select * from personnel order by " & sortby You should check to see if sortby is empty, and set it to a default sorting method if so. sortby=last_name,first_name Then in you just dynamically build your sql... mysql="select * from personnel order by " & sortby You should check to see if sortby is empty, and set it to a default sorting method if so. You should never I'm not an expert on it but if I understand correctly one attack involves appending SQL Statements.I am passing a sql string thru my querystring for the next page to capture. str=select * from table where name like '%doe%' Passing a basic string works fine.