69472

How can I use wildcards with string::find?

Question:

I want to be able to use a wildcard in string::find and then fetch what was in that wildcard place.

For example:

if (string::npos !=input.find("How is * doing?") { cout<<"(the wildcard) is doing fine."<<endl; }

And so if I ask, "How is Mom doing?", the output would be "Mom is doing fine."

What libraries would I use for this, or how would I write the code manually? If I should use AIML, can AIML execute .bat files?

Answer1:

Regarding your question on how to do it manually, i will give you an idea with this simple code, which solves the example which you gave in the question.

#include<iostream> #include<string> using namespace std; int main() { string expr="How is * doing?"; string input="How is Mom doing?"; int wildcard_pos=expr.find("*"); if(wildcard_pos!=string::npos) { int foo=input.find(expr.substr(0,wildcard_pos)),bar=input.find(expr.substr(wildcard_pos+1)); if(foo!=string::npos && bar!=string::npos) cout<<input.substr(wildcard_pos,bar-wildcard_pos)<<" is doing fine\n"; } }

You can easily modify this idea to suit your needs. Else, follow the answer given by src

Answer2:

C++ 2011 provides a <a href="http://en.wikipedia.org/wiki/C%2B%2B11#Regular_expressions" rel="nofollow">regular expression library</a>. If you can't use C++ 2011 yet you can use the <a href="http://www.boost.org/doc/libs/1_50_0/libs/regex/doc/html/index.html" rel="nofollow">Boost.Regex</a> library or any C library like <a href="http://www.pcre.org/" rel="nofollow">PCRE</a>.

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