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regex.cpp
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regex.cpp
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#include <string>
#include <map>
#include <string.h>
/* gnu/posix's regex header */
// #include <regex.h>
// #include "trex/trex.h"
#include "pcre/pcre.h"
/* our regex header */
#include "regex.h"
using namespace std;
namespace Util{
static map<string, pcre*> cachedPatterns;
Regex::Regex(const string & data):
data(data){
}
const std::string & Regex::get() const {
return data;
}
/* http://www.gnu.org/s/libc/manual/html_node/Regular-Expressions.html */
bool matchRegex(const string & str, const Regex & pattern){
pcre * regex;
const char * error;
int errorOffset;
int count;
regex = cachedPatterns[pattern.get()];
if (regex == NULL){
regex = pcre_compile(pattern.get().c_str(), 0, &error, &errorOffset, NULL);
if (regex == NULL){
return false;
}
cachedPatterns[pattern.get()] = regex;
}
count = pcre_exec(regex, NULL, str.c_str(), str.size(), 0, 0, NULL, 0);
// pcre_free(regex);
return count >= 0;
}
string captureRegex(const string & str, const Regex & pattern, int capture){
pcre * regex;
const char * error;
int errorOffset;
int count;
const int captureMax = 100;
int captures[captureMax];
regex = cachedPatterns[pattern.get()];
if (regex == NULL){
regex = pcre_compile(pattern.get().c_str(), 0, &error, &errorOffset, NULL);
if (regex == NULL){
return "";
}
cachedPatterns[pattern.get()] = regex;
}
count = pcre_exec(regex, NULL, str.c_str(), str.size(), 0, 0, captures, captureMax);
// pcre_free(regex);
if (count >= 0 && capture < count){
int start = captures[(capture + 1) * 2];
int end = captures[(capture + 1) * 2 + 1];
return str.substr(start, end - start);
}
return "";
}
} // namespace

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