Re: [Boost-users] regular expression problems
Sorry, but this strays a little from actual boost. Since there are a handful of you that are probably using regex, I was hoping someone could help with syntax.
I have a regex that validates a latitude format.
These are the restrictions:
Must have an N or S as first letter.
It can be all values from 0.0 to 90.0
My first shot at it confirmed format, but not data constraints: "(N|S)\\d{2}\\.\\d{1,6} <file:///\\d%7b2%7d\d%7b1,6%7d> "
But any attempts to limit the constraints caused an exception in regex. Is there something wrong w/ how I formatted this: "(N|S)(9[0]\\.0{1-6}|[0-8]\\d\\.\\d{1-6} <file:///\\.0%7b1-6%7d|[0-8]\d\d%7b1-6%7d> )"
To me, it reads: 1st char must be N|S
If second char is 9, the next chars must be 0.0 through 0.000000
Else
If char is 0-8, then the next just has to be digits [0-9].[0-9]{1-6}
Can anyone tell me what I am doing wrong?
There are no numeric constraints available in the regular expression language, and the {} operator are for constrained repeats with 1{1-6} not being a valid syntax. How about something like: (N|S)\\d(\\.\\d+|[1-8](\\.\\d+)?|9(\\.0+)?)? HTH, John.
John Maddock wrote:
I have a regex that validates a latitude format.
These are the restrictions:
Must have an N or S as first letter.
It can be all values from 0.0 to 90.0
My first shot at it confirmed format, but not data constraints: "(N|S)\\d{2}\\.\\d{1,6} <file:///\\d%7b2%7d\d%7b1,6%7d> "
But any attempts to limit the constraints caused an exception in regex. Is there something wrong w/ how I formatted this: "(N|S)(9[0]\\.0{1-6}|[0-8]\\d\\.\\d{1-6} <file:///\\.0%7b1-6%7d|[0-8]\d\d%7b1-6%7d> )"
To me, it reads: 1st char must be N|S
If second char is 9, the next chars must be 0.0 through 0.000000
Else
If char is 0-8, then the next just has to be digits [0-9].[0-9]{1-6}
Can anyone tell me what I am doing wrong?
There are no numeric constraints available in the regular expression language, and the {} operator are for constrained repeats with 1{1-6} not being a valid syntax.
How about something like:
(N|S)\\d(\\.\\d+|[1-8](\\.\\d+)?|9(\\.0+)?)?
I don't think that will match what he wants. It will match things like "N99.0", which he prohibits. It looks like the problem is "{1-6}" is invalid syntax. It should be "{1,6}". In fact, that's what he wrote in his first shot, but not in his second. http://www.boost.org/doc/libs/1_38_0/libs/regex/doc/html/boost_regex/syntax/... -- Anthony Foglia
That's correct. I hadn't gotten around to writing an update, but yes, my problem was the 1-6 as opposed to 1,6. Thanks Jason -----Original Message----- From: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Anthony Foglia Sent: Thursday, April 23, 2009 2:04 PM To: boost-users@lists.boost.org Subject: Re: [Boost-users] regular expression problems John Maddock wrote:
I have a regex that validates a latitude format.
These are the restrictions:
Must have an N or S as first letter.
It can be all values from 0.0 to 90.0
My first shot at it confirmed format, but not data constraints: "(N|S)\\d{2}\\.\\d{1,6} <file:///\\d%7b2%7d\d%7b1,6%7d> "
But any attempts to limit the constraints caused an exception in regex. Is there something wrong w/ how I formatted this: "(N|S)(9[0]\\.0{1-6}|[0-8]\\d\\.\\d{1-6} <file:///\\.0%7b1-6%7d|[0-8]\d\d%7b1-6%7d> )"
To me, it reads: 1st char must be N|S
If second char is 9, the next chars must be 0.0 through 0.000000
Else
If char is 0-8, then the next just has to be digits [0-9].[0-9]{1-6}
Can anyone tell me what I am doing wrong?
There are no numeric constraints available in the regular expression language, and the {} operator are for constrained repeats with 1{1-6} not being a valid syntax.
How about something like:
(N|S)\\d(\\.\\d+|[1-8](\\.\\d+)?|9(\\.0+)?)?
I don't think that will match what he wants. It will match things like "N99.0", which he prohibits. It looks like the problem is "{1-6}" is invalid syntax. It should be "{1,6}". In fact, that's what he wrote in his first shot, but not in his second. http://www.boost.org/doc/libs/1_38_0/libs/regex/doc/html/boost_regex/syntax/ perl_syntax.html -- Anthony Foglia _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
participants (4)
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Anthony Foglia -
Green, Jason M NSWCDL, W33 -
John Maddock