Regular Expressions (Pattern Matching)

[areric]

Hey all,

Im trying to do a C++ program that checks a string to match a pattern. Namely im looking for it to record the string if it matches
AA###### where A is any alphabetic char (a-z, A-Z) and # os any number 0-9.

I know i can do this in regular expressions as a web based front end im using for this program has it already built in, but i cant figure out how to call ereg() in c++.

If you know of an answer or another alternative to check this pattern its greatly appreciated

Thanks

P.S. im using VS6 not .net

 

[Leibnitz]

i'm not sure it is what you are looking for,but you might try something like this:

#include <ctype.h>
.....
..
bool checkString( char *str )
{
   if( !isalpha(str[0]) || !isalpha(str[1]))
   { 
        return false;
   }
   for( int i = 2; str[i] != 0; i++ )
   {
      if(!isdigit(str[i])) 
         return false;
   }
   return true;
}

 

[ArkM]

What's a problem? Download Regex++ from

http://ourworld.compuserve.com/homepages/John_Maddock/regexpp.htm

and go on! There are lot of docs in the distribution...
Good luck!

 

[areric]

thanks alot everyone, ill try out regex++ and see what its like. I ported that function above to string class strings and it works pretty well so thanks.

 

[Cagliostro]

by the way, there is an implementation of regular expressions in ATL. Try somethink like this:

#include <atlrx.h>
#include<stdio.h>
int main(int argc, char* argv[])
{
   CAtlRegExp<> reUrl;
   // five match groups: scheme, authority, path, query, fragment
   REParseError status = reUrl.Parse("({[^:/?#]+}:)?(//{[^/?#]*})?{[^?#]*}(?{[^#]*})?(#{.*})?" );
   if (REPARSE_ERROR_OK != status)return 0;//unepected error
   CAtlREMatchContext<> mcUrl;
   if (!reUrl.Match("[URL unfurl="true"]http://search.microsoft.com/us/Search.asp?qu=atl&boolean=ALL#results",[/URL] &mcUrl))
   {
      // Unexpected error.
      return 0;
   }
   for (UINT nGroupIndex = 0; nGroupIndex < mcUrl.m_uNumGroups; ++nGroupIndex)
   {
      const CAtlREMatchContext<>::RECHAR* szStart = 0;
      const CAtlREMatchContext<>::RECHAR* szEnd = 0;
      mcUrl.GetMatch(nGroupIndex, &szStart, &szEnd);
      ptrdiff_t nLength = szEnd - szStart;
      printf("%d: \"%.*s\"\n", nGroupIndex, nLength, szStart);
   }
}

Ion Filipski