Mega Code Archive

 

Categories / C / Development

 

Print ip addresses found in text

#include <stdio.h> #include <regex.h> #include <locale.h> #include <string.h> #include <stdlib.h> #include <sys/types.h> #define IPEXPR "([0-9]{1,3})\\.([0-9]{1,3})\\.([0-9]{1,3})\\.([0-9]{1,3})" int main(void) { char line[1024]; char *address = NULL; char delim[] = ",:;`/\"+-_(){}[]<>*&^%$#@!?~/|\\= \t\r\n"; int retval = 0; regex_t re; setlocale(LC_ALL, ""); if(regcomp(&re, IPEXPR, REG_EXTENDED) != 0) return 1; while((fgets(line, 1024, stdin)) != NULL) { if(strchr(line, '.') == NULL) continue; address = strtok(line, delim); while(address != NULL) { if(strlen(address) <= 15) if((retval = regexec(&re, address, 0, NULL, 0)) == 0) printf("%s\n", address); address = strtok(NULL, delim); } /* while */ } /* while */ return 0; }