Encapsulates the use of common regular expressions
- 2020-04-02 02:10:31
- OfStack
Regexhelper. H
#ifndef REGEX_HELPER_H_INCLUDE
#define REGEX_HELPER_H_INCLUDE
#include<string>
#include<vector>
namespace Framework{
class RegexHelper
{
public:
RegexHelper();
virtual ~RegexHelper();
static bool IsMatch(const char* input,const char* pattern);
static std::string Match(const char* input,const char* pattern,int group = 0);
static int Match(const char* input,const char* pattern,std::vector<std::string>& results);
static int Matches(const char* input,const char* pattern);
static int Matches(const char* input,const char* pattern,std::vector<std::string>& results,int group = 0);
static std::string ReplaceFirst(const char* input,const char* pattern,const char* repValue);
static std::string ReplaceAll(const char* input,const char* pattern,const char* repValue);
static int Split(const char* input,const char* pattern,std::vector<std::string>& results);
static int Split(const char* input,const char* pattern,std::vector<int>& subs,std::vector<std::string>& results);
protected:
private:
};
}
#endif // REGEX_HELPER_H_INCLUDE
Regexhelper. CPP
#include "regexhelper.h"
#include<boost/regex.hpp>
namespace Framework{
RegexHelper::RegexHelper()
{
//ctor
}
RegexHelper::~RegexHelper()
{
//dtor
}
bool RegexHelper::IsMatch(const char* input,const char* pattern)
{
boost::regex reg( pattern , boost::regex::perl|boost::regex::icase);
bool ret = boost::regex_search( input , reg);
return ret;
}
std::string RegexHelper::Match(const char* input,const char* pattern,int group)
{
if(group < 0)group = 0;
boost::cmatch mat;
boost::regex reg( pattern , boost::regex::perl|boost::regex::icase);
bool success = boost::regex_search( input, mat, reg);
if(success){
if(mat[group].matched){
return std::string(mat[group]);
}
}
return std::string("");
}
int RegexHelper::Match(const char* input,const char* pattern,std::vector<std::string>& results)
{
boost::cmatch mat;
boost::regex reg( pattern , boost::regex::perl|boost::regex::icase );
bool success =boost::regex_search( input, mat, reg);
int total = 0;
if(success){ //If the match is successful
//cout << "match success" << endl;
//Displays all substrings
for(boost::cmatch::iterator itr=mat.begin(); itr!=mat.end(); ++itr){
//& have spent & have spent & have spent & have spent & have spent & have spent The pointing substring corresponds to the leading position & NBSP; & have spent & have spent & have spent & have spent & have spent & have spent Pointing to substring corresponding to tail position & NBSP; & have spent & have spent & have spent & have spent & have spent & have spent & have spent & have spent Content of the substring
//cout << itr->first-szStr << ' ' << itr->second-szStr << ' ' << *itr << endl;
results.push_back(std::string(*itr));
total++ ;
}
}
return total;
}
int RegexHelper::Matches(const char* input,const char* pattern)
{
boost::regex reg( pattern, boost::regex::perl|boost::regex::icase); //Find the number in the string
boost::cregex_iterator itrBegin = make_regex_iterator(input,reg); //(szStr, szStr+strlen(szStr), reg);
boost::cregex_iterator itrEnd;
int total = 0;
for(boost::cregex_iterator itr=itrBegin; itr!=itrEnd; ++itr){
//cout << (*itr)[0].first-szStr << ' ' << (*itr)[0].second-szStr << ' ' << *itr << endl;
total++;
}
return total;
}
int RegexHelper::Matches(const char* input,const char* pattern,std::vector<std::string>& results,int group)
{
if(group < 0)group = 0;
boost::regex reg( pattern, boost::regex::perl|boost::regex::icase); //Find the number in the string
boost::cregex_iterator itrBegin = make_regex_iterator(input,reg); //(szStr, szStr+strlen(szStr), reg);
boost::cregex_iterator itrEnd;
int total = 0;
for(boost::cregex_iterator itr=itrBegin; itr!=itrEnd; ++itr){
//cout << (*itr)[0].first-szStr << ' ' << (*itr)[0].second-szStr << ' ' << *itr << endl;
results.push_back(std::string((*itr)[group]));
total++;
}
return total;
}
std::string RegexHelper::ReplaceFirst(const char* input,const char* pattern,const char* repValue)
{
//( 1 ) (( 3 ) 2 )(( 5 )4)( 6 )
//(/w+)://((/w+/.)*/w+)((//w*)*)(//w+/./w+)?
//^ agreement :// The url (x.x...x)/ The path (n a / string )/ Web page file (xxx.xxx)
//const char *szReg = "(\w+)://((\w+\.)*\w+)((/\w*)*)(/\w+\.\w+)?";
//const char *szStr = "http://www.cppprog.com/2009/0112/48.html";
//repValue = ""
boost::regex reg( pattern , boost::regex::perl|boost::regex::icase);
std::string sret = boost::regex_replace( std::string(input), reg, std::string(repValue));
return sret;
}
std::string RegexHelper::ReplaceAll(const char* input,const char* pattern,const char* repValue)
{
//string s1 = "(<)|(>)|(&)";
//string s2 = "(?1<)(?2>)(?3&)";
boost::regex reg( pattern , boost::regex::perl|boost::regex::icase);
std::string sret = boost::regex_replace( std::string(input), reg, std::string(repValue), boost::match_default | boost::format_all);
return sret;
}
int RegexHelper::Split(const char* input,const char* pattern,std::vector<std::string>& results)
{
boost::regex reg(pattern, boost::regex::perl|boost::regex::icase); //Split the string by /
boost::cregex_token_iterator itrBegin = make_regex_token_iterator(input,reg,-1); //Split when -1 parameter is used, which substring is taken when other Numbers are used, and multiple strings can be taken by array
boost::cregex_token_iterator itrEnd;
int total = 0;
for(boost::cregex_token_iterator itr=itrBegin; itr!=itrEnd; ++itr){
//cout << *itr << endl;
results.push_back(std::string(*itr));
total++;
}
return total;
}
int RegexHelper::Split(const char* input,const char* pattern,std::vector<int>& subs,std::vector<std::string>& results)
{
boost::regex reg(pattern, boost::regex::perl|boost::regex::icase); //Take the first and last characters of/(this string image seems to be a bit evil -_-)
boost::cregex_token_iterator itrBegin = make_regex_token_iterator(input,reg,subs); //Split when -1 parameter is used, which substring is taken when other Numbers are used, and multiple strings can be taken by array
boost::cregex_token_iterator itrEnd;
int total = 0;
for(boost::cregex_token_iterator itr=itrBegin; itr!=itrEnd; ++itr){
//cout << *itr << endl;
results.push_back(std::string(*itr));
total++;
}
return total;
}
}
The test code
void testregex()
{
//( 1 ) (( 3 ) 2 )(( 5 )4)( 6 )
//(/w+)://((/w+/.)*/w+)((//w*)*)(//w+/./w+)?
//^ agreement :// The url (x.x...x)/ The path (n a / string )/ Web page file (xxx.xxx)
const char *szReg = "(\w+)://((\w+\.)*\w+)((/\w*)*)(/\w+\.\w+)?";
const char *szStr = "sss http://www.cppprog.com/2009/0112/48.html";
{ //String matching
cout <<"match:"<< Framework::RegexHelper::IsMatch(szStr,szReg)<<endl;
//assert(r);
}
{ //Extract the substring
vector<string> results;
int total = Framework::RegexHelper::Match(szStr,szReg,results);
cout << "total="<<total<<endl;
if(total > 0){
for(vector<string>::const_iterator it = results.begin(); it != results.end(); ++it){
cout<< *it <<endl;
}
}
}
{ //To find the
cout<<Framework::RegexHelper::Match(szStr,"\d+")<<endl;
}
{ //replace
cout<<Framework::RegexHelper::ReplaceFirst(szStr,szReg,"ftp://$2$5")<<endl;
}
{ //replace2 , <>& Convert to web page characters
string s1 = "(<)|(>)|(&)";
string s2 = "(?1<)(?2>)(?3&)";
cout<<Framework::RegexHelper::ReplaceFirst("cout << a&b << endl;",s1.c_str(),s2.c_str())<<endl;
cout<<Framework::RegexHelper::ReplaceAll("cout << a&b << endl;",s1.c_str(),s2.c_str())<<endl;
}
{ //Use the iterator to find all the Numbers
vector<string> results;
int total = Framework::RegexHelper::Matches(szStr,"\d+",results);
cout << "total="<<total<<endl;
if(total > 0){
for(vector<string>::const_iterator it = results.begin(); it != results.end(); ++it){
cout<< *it <<endl;
}
}
}
{ //Use iterators to split strings
vector<string> results;
int total = Framework::RegexHelper::Split(szStr,"/",results);
cout << "total="<<total<<endl;
if(total > 0){
for(vector<string>::const_iterator it = results.begin(); it != results.end(); ++it){
cout<< *it <<endl;
}
}
}
{ //Use iterators to split strings2
vector<string> results;
//The first substring and the second substring
vector<int> subv;subv.push_back(1),subv.push_back(2);
//Take the first and last characters of/(this string image seems to be a bit evil -_-)
int total = Framework::RegexHelper::Split(szStr,"(.)/(.)",subv,results);
cout << "total="<<total<<endl;
if(total > 0){
for(vector<string>::const_iterator it = results.begin(); it != results.end(); ++it){
cout<< *it <<endl;
}
}
}
}