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#include <stdio.h>
#include <string.h>
#include <pcre.h>
/* Compile thuswise:
gcc -Wall pcredemo.c -I/opt/local/include -L/opt/local/lib \
-R/opt/local/lib -lpcre
*/
#define OVECCOUNT 30 /* should be a multiple of 3 */
int main(int argc, char **argv)
{
pcre *re;
const char *error;
int erroffset;
int ovector[OVECCOUNT];
int rc, i;
if (argc != 3)
{
printf("Two arguments required: a regex and a subject string\n");
return 1;
}
/* Compile the regular expression in the first argument */
re = pcre_compile(
argv[1], /* the pattern */
0, /* default options */
&error, /* for error message */
&erroffset, /* for error offset */
NULL); /* use default character tables */
/* Compilation failed: print the error message and exit */
if (re == NULL)
{
printf("PCRE compilation failed at offset %d: %s\n", erroffset, error);
return 1;
}
/* Compilation succeeded: match the subject in the second argument */
rc = pcre_exec(
re, /* the compiled pattern */
NULL, /* no extra data - we didn't study the pattern */
argv[2], /* the subject string */
(int)strlen(argv[2]), /* the length of the subject */
0, /* start at offset 0 in the subject */
0, /* default options */
ovector, /* output vector for substring information */
OVECCOUNT); /* number of elements in the output vector */
/* Matching failed: handle error cases */
if (rc < 0)
{
switch(rc)
{
case PCRE_ERROR_NOMATCH: printf("No match\n"); break;
/*
Handle other special cases if you like
*/
default: printf("Matching error %d\n", rc); break;
}
return 1;
}
/* Match succeded */
printf("Match succeeded\n");
/* The output vector wasn't big enough */
if (rc == 0)
{
rc = OVECCOUNT/3;
printf("ovector only has room for %d captured substrings\n", rc - 1);
}
/* Show substrings stored in the output vector */
for (i = 0; i < rc; i++)
{
char *substring_start = argv[2] + ovector[2*i];
int substring_length = ovector[2*i+1] - ovector[2*i];
printf("%2d: %.*s\n", i, substring_length, substring_start);
}
return 0;
}
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