boost regex 数据有效性检测

头文件：

 

#ifndef __VALIDFILTER__H #define __VALIDFILTER__H #define VALIDFILTER_FLOATNUM            "([0-9]+).([0-9]+)|([0-9]+)" #define VALIDFILTER_FLOAT                "([0-9]+).([0-9]+)" #define VALIDFILTER_NUM                "[0-9]+" #define VALIDFILTER_ALPHABET            "[a-z]+" #define VALIDFILTER_                    "" #include <iostream> #include <boost/regex.hpp> using namespace boost; using namespace std; class validfilter { public:     validfilter(void);     ~validfilter(void);     bool IsFloatAndNum( std::string value);     bool IsFloat( std::string value);     bool IsNum( std::string value);     bool IsAlphabet( std::string value); private:     bool validmatch( std::string& value,std::string regex_expression); }; #endif

.cpp

#include "validfilter.h" using namespace boost; using namespace std; validfilter::validfilter(void) { } validfilter::~validfilter(void) { } bool validfilter::IsFloatAndNum( std::string value) {     return validmatch( value,VALIDFILTER_FLOATNUM); } bool validfilter::IsFloat( std::string value) {     return validmatch( value,VALIDFILTER_FLOAT);     } bool validfilter::IsNum( std::string value) {     return validmatch( value,VALIDFILTER_NUM);     } bool validfilter::IsAlphabet( std::string value) {     return validmatch( value,VALIDFILTER_ALPHABET); } bool validfilter::validmatch( std::string& value,std::string regex_expression) {     if( value.empty() || regex_expression.empty() )         return false;     boost::regex expression(regex_expression);     if( regex_match( value,expression)) //字符串匹配     {         return true;     }     else     {         return false;     } }

demo测试程序

 

#include <iostream> #include <stdio.h> #include "validfilter.h" using namespace std; int _tmain(int argc, _TCHAR* argv[]) {     validfilter filter;     bool state;     std::string str;     while(1)     {         cout<<"input:"<<endl;         cin>> str;         if( filter.IsFloatAndNum( str ) )         {             cout<<"数字浮点"<<endl;             continue;         }         if( filter.IsAlphabet( str ) )         {             cout<<"字母"<<endl;             continue;         }         if( filter.IsFloat( str ))         {             cout<<"浮点"<<endl;             continue;         }                 if( filter.IsNum(str) )         {             cout<<"数字"<<endl;             continue;         }         if( str == "quit")         {             return 0;         }     }        return 0; }

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