您知道C++中基于正则表达式的解析器,可以用来解析流吗?

AFAIK boost::regex应该知道如何处理流,并且它支持perl正则表达式

好吧,这里有PCRE。

用pcre实现的最小grep(请注意,要搜索的表达式在运行时在命令行中提供):

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include "pcre.h"
#define OVECCOUNT 30    /* should be a multiple of 3 */

/* only needed if your libc doesn't include it! */
#include "getline.c" 

int main(int argc, char**argv){
  char *res;
  char *fname;
  const char *error;
  int erroroffset;
  pcre *re=NULL;

  /* Grab the search expression from the first command line argument */
  if (--argc) {
    res=(++argv)[0];
    re=pcre_compile(res,0,&error,&erroroffset,NULL);
    if (re==NULL) /* compilation failed, bomb out */ exit(1);
  }

  /* All further command line arguments are files to grep in */
  while (--argc) {
    FILE*f=NULL;
    fname=(++argv)[0];

    if (f=fopen(fname,"r")) {
      char *line=NULL;
      size_t l=0;
      while (-1 != getline(&line,&l,f)) {
    int ovector[OVECCOUNT];
    if ( pcre_exec(re,NULL,line,l,0,0,ovector,OVECCOUNT) > 0 ) {
      printf("%s",line);
    }

    free(line);
    line = NULL; l=0;
      }

      fclose(f);
    }
  }
  free(re);
  return 0;
}

$ ./pcregrep char pcregrep.c
int main(int argc, char**argv){
  char *res;
  char *fname;
  const char *error;
      char *line=NULL;