code/trunk/pcredemo.c

#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;
}


1	nigel	53	#include <stdio.h>
2			#include <string.h>
3			#include <pcre.h>
4
5			/* Compile thuswise:
6			gcc -Wall pcredemo.c -I/opt/local/include -L/opt/local/lib \
7			-R/opt/local/lib -lpcre
8			*/
9
10			#define OVECCOUNT 30 /* should be a multiple of 3 */
11
12			int main(int argc, char **argv)
13			{
14			pcre *re;
15			const char *error;
16			int erroffset;
17			int ovector[OVECCOUNT];
18			int rc, i;
19
20			if (argc != 3)
21			{
22			printf("Two arguments required: a regex and a subject string\n");
23			return 1;
24			}
25
26			/* Compile the regular expression in the first argument */
27
28			re = pcre_compile(
29			argv[1], /* the pattern */
30			0, /* default options */
31			&error, /* for error message */
32			&erroffset, /* for error offset */
33			NULL); /* use default character tables */
34
35			/* Compilation failed: print the error message and exit */
36
37			if (re == NULL)
38			{
39			printf("PCRE compilation failed at offset %d: %s\n", erroffset, error);
40			return 1;
41			}
42
43			/* Compilation succeeded: match the subject in the second argument */
44
45			rc = pcre_exec(
46			re, /* the compiled pattern */
47			NULL, /* no extra data - we didn't study the pattern */
48			argv[2], /* the subject string */
49			(int)strlen(argv[2]), /* the length of the subject */
50			0, /* start at offset 0 in the subject */
51			0, /* default options */
52			ovector, /* output vector for substring information */
53			OVECCOUNT); /* number of elements in the output vector */
54
55			/* Matching failed: handle error cases */
56
57			if (rc < 0)
58			{
59			switch(rc)
60			{
61			case PCRE_ERROR_NOMATCH: printf("No match\n"); break;
62			/*
63			Handle other special cases if you like
64			*/
65			default: printf("Matching error %d\n", rc); break;
66			}
67			return 1;
68			}
69
70			/* Match succeded */
71
72			printf("Match succeeded\n");
73
74			/* The output vector wasn't big enough */
75
76			if (rc == 0)
77			{
78			rc = OVECCOUNT/3;
79			printf("ovector only has room for %d captured substrings\n", rc - 1);
80			}
81
82			/* Show substrings stored in the output vector */
83
84			for (i = 0; i < rc; i++)
85			{
86			char substring_start = argv[2] + ovector[2i];
87			int substring_length = ovector[2i+1] - ovector[2i];
88			printf("%2d: %.*s\n", i, substring_length, substring_start);
89			}
90
91			return 0;
92			}
93
94