regex example using pcre.

pcre-eg.c

#!/usr/bin/tcc -run -lpcre
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pcre.h>
int main(int argc,char*argv[]){
  int ov[9],errofs;
  char b[1024];
  const char* err;
  pcre *re=pcre_compile("Revision: (\\d+)",0,&err,&errofs,NULL);
  while(fgets(b,1024,stdin)!='\0'){
    if(pcre_exec(re,NULL,b,strlen(b),0,0,ov,9)>0){;
      printf("%d",atoi(&b[ov[2]]));
    }
  }
  free(re);
}