Shaolin wrote:
Hi Guys
I am using boost.regex to check whether a string has opening and closing brackets. The problem is the expression doesnt work. I have tried all sorts of combos and read up the doc too to no avail. Can someone tell me whether
Well, you could use something like "[\\(][^\\)]*[\\)]", ie match a left
paren, any number of things that are not a right paren and then a right
paren. Of course, a simple check like this can't detect all the ways is
which the equation can still be incomplete or invalid (e.g. "(2++1)--3"). To
really an truly make sure that the equation is well formed you could use the
boost spirit library (have a look at the calculator example).
--gs
_____
From: boost-users-bounces@lists.boost.org
[mailto:boost-users-bounces@lists.boost.org] On Behalf Of Shaolin
Sent: Thursday, March 11, 2010 10:57 AM
To: boost-users@lists.boost.org
Subject: Re: [Boost-users] Boost.regex expression construction
Hello Gevorg,
An example string: (4+1)*2 - I want to return true if the parentheses are
found and false if there are none or there is a partial match ( e.g. (2+2+1
will return false because there is only one parenthese and hence the
equation is incomplete).
Regards
On 11 March 2010 15:43, Gevorg Voskanyan
boost::regex e("[\\(\\)]"); /*check for opening/closing brackets*/
Regards
I'm afraid it's not clear enough what you are trying to match here. Perhaps you could give us an example of a string which would match the expression? Regards, Gevorg _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users