/[pcre]/code/trunk/pcredemo.c
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revision 63 by nigel, Sat Feb 24 21:40:03 2007 UTC revision 477 by ph10, Sun Jan 3 15:53:09 2010 UTC
# Line 4  Line 4 
4    
5  /* This is a demonstration program to illustrate the most straightforward ways  /* This is a demonstration program to illustrate the most straightforward ways
6  of calling the PCRE regular expression library from a C program. See the  of calling the PCRE regular expression library from a C program. See the
7  pcresample documentation for a short discussion.  pcresample documentation for a short discussion ("man pcresample" if you have
8    the PCRE man pages installed).
9    
10  Compile thuswise:  In Unix-like environments, if PCRE is installed in your standard system
11    gcc -Wall pcredemo.c -I/opt/local/include -L/opt/local/lib \  libraries, you should be able to compile this program using this command:
     -R/opt/local/lib -lpcre  
12    
13  Replace "/opt/local/include" and "/opt/local/lib" with wherever the include and  gcc -Wall pcredemo.c -lpcre -o pcredemo
14    
15    If PCRE is not installed in a standard place, it is likely to be installed with
16    support for the pkg-config mechanism. If you have pkg-config, you can compile
17    this program using this command:
18    
19    gcc -Wall pcredemo.c `pkg-config --cflags --libs libpcre` -o pcredemo
20    
21    If you do not have pkg-config, you may have to use this:
22    
23    gcc -Wall pcredemo.c -I/usr/local/include -L/usr/local/lib \
24      -R/usr/local/lib -lpcre -o pcredemo
25    
26    Replace "/usr/local/include" and "/usr/local/lib" with wherever the include and
27  library files for PCRE are installed on your system. Only some operating  library files for PCRE are installed on your system. Only some operating
28  systems (e.g. Solaris) use the -R option.  systems (e.g. Solaris) use the -R option.
 */  
29    
30    Building under Windows:
31    
32    If you want to statically link this program against a non-dll .a file, you must
33    define PCRE_STATIC before including pcre.h, otherwise the pcre_malloc() and
34    pcre_free() exported functions will be declared __declspec(dllimport), with
35    unwanted results. So in this environment, uncomment the following line. */
36    
37    /* #define PCRE_STATIC */
38    
39  #include <stdio.h>  #include <stdio.h>
40  #include <string.h>  #include <string.h>
# Line 39  int subject_length; Line 59  int subject_length;
59  int rc, i;  int rc, i;
60    
61    
62  /*************************************************************************  /**************************************************************************
63  * First, sort out the command line. There is only one possible option at *  * First, sort out the command line. There is only one possible option at  *
64  * the moment, "-g" to request repeated matching to find all occurrences, *  * the moment, "-g" to request repeated matching to find all occurrences,  *
65  * like Perl's /g option. We set the variable find_all non-zero if it is  *  * like Perl's /g option. We set the variable find_all to a non-zero value *
66  * present. Apart from that, there must be exactly two arguments.         *  * if the -g option is present. Apart from that, there must be exactly two *
67  *************************************************************************/  * arguments.                                                              *
68    **************************************************************************/
69    
70  find_all = 0;  find_all = 0;
71  for (i = 1; i < argc; i++)  for (i = 1; i < argc; i++)
# Line 90  if (re == NULL) Line 111  if (re == NULL)
111    
112  /*************************************************************************  /*************************************************************************
113  * If the compilation succeeded, we call PCRE again, in order to do a     *  * If the compilation succeeded, we call PCRE again, in order to do a     *
114  * pattern match against the subject string. This just does ONE match. If *  * pattern match against the subject string. This does just ONE match. If *
115  * further matching is needed, it will be done below.                     *  * further matching is needed, it will be done below.                     *
116  *************************************************************************/  *************************************************************************/
117    
# Line 116  if (rc < 0) Line 137  if (rc < 0)
137      */      */
138      default: printf("Matching error %d\n", rc); break;      default: printf("Matching error %d\n", rc); break;
139      }      }
140      pcre_free(re);     /* Release memory used for the compiled pattern */
141    return 1;    return 1;
142    }    }
143    
# Line 126  printf("\nMatch succeeded at offset %d\n Line 148  printf("\nMatch succeeded at offset %d\n
148    
149  /*************************************************************************  /*************************************************************************
150  * We have found the first match within the subject string. If the output *  * We have found the first match within the subject string. If the output *
151  * vector wasn't big enough, set its size to the maximum. Then output any *  * vector wasn't big enough, say so. Then output any substrings that were *
152  * substrings that were captured.                                         *  * captured.                                                              *
153  *************************************************************************/  *************************************************************************/
154    
155  /* The output vector wasn't big enough */  /* The output vector wasn't big enough */
# Line 149  for (i = 0; i < rc; i++) Line 171  for (i = 0; i < rc; i++)
171    }    }
172    
173    
174  /*************************************************************************  /**************************************************************************
175  * That concludes the basic part of this demonstration program. We have   *  * That concludes the basic part of this demonstration program. We have    *
176  * compiled a pattern, and performed a single match. The code that follows*  * compiled a pattern, and performed a single match. The code that follows *
177  * first shows how to access named substrings, and then how to code for   *  * shows first how to access named substrings, and then how to code for    *
178  * repeated matches on the same subject.                                  *  * repeated matches on the same subject.                                   *
179  *************************************************************************/  **************************************************************************/
180    
181  /* See if there are any named substrings, and if so, show them by name. First  /* See if there are any named substrings, and if so, show them by name. First
182  we have to extract the count of named parentheses from the pattern. */  we have to extract the count of named parentheses from the pattern. */
# Line 211  if (namecount <= 0) printf("No named sub Line 233  if (namecount <= 0) printf("No named sub
233  *                                                                        *  *                                                                        *
234  * If the previous match WAS for an empty string, we can't do that, as it *  * If the previous match WAS for an empty string, we can't do that, as it *
235  * would lead to an infinite loop. Instead, a special call of pcre_exec() *  * would lead to an infinite loop. Instead, a special call of pcre_exec() *
236  * is made with the PCRE_NOTEMPTY and PCRE_ANCHORED flags set. The first  *  * is made with the PCRE_NOTEMPTY_ATSTART and PCRE_ANCHORED flags set.    *
237  * of these tells PCRE that an empty string is not a valid match; other   *  * The first of these tells PCRE that an empty string at the start of the *
238  * possibilities must be tried. The second flag restricts PCRE to one     *  * subject is not a valid match; other possibilities must be tried. The   *
239  * match attempt at the initial string position. If this match succeeds,  *  * second flag restricts PCRE to one match attempt at the initial string  *
240  * an alternative to the empty string match has been found, and we can    *  * position. If this match succeeds, an alternative to the empty string   *
241  * proceed round the loop.                                                *  * match has been found, and we can proceed round the loop.               *
242  *************************************************************************/  *************************************************************************/
243    
244  if (!find_all) return 0;   /* Finish unless -g was given */  if (!find_all)
245      {
246      pcre_free(re);   /* Release the memory used for the compiled pattern */
247      return 0;        /* Finish unless -g was given */
248      }
249    
250  /* Loop for second and subsequent matches */  /* Loop for second and subsequent matches */
251    
# Line 235  for (;;) Line 261  for (;;)
261    if (ovector[0] == ovector[1])    if (ovector[0] == ovector[1])
262      {      {
263      if (ovector[0] == subject_length) break;      if (ovector[0] == subject_length) break;
264      options = PCRE_NOTEMPTY | PCRE_ANCHORED;      options = PCRE_NOTEMPTY_ATSTART | PCRE_ANCHORED;
265      }      }
266    
267    /* Run the next matching operation */    /* Run the next matching operation */
# Line 270  for (;;) Line 296  for (;;)
296    if (rc < 0)    if (rc < 0)
297      {      {
298      printf("Matching error %d\n", rc);      printf("Matching error %d\n", rc);
299        pcre_free(re);    /* Release memory used for the compiled pattern */
300      return 1;      return 1;
301      }      }
302    
# Line 310  for (;;) Line 337  for (;;)
337    }      /* End of loop to find second and subsequent matches */    }      /* End of loop to find second and subsequent matches */
338    
339  printf("\n");  printf("\n");
340    pcre_free(re);       /* Release memory used for the compiled pattern */
341  return 0;  return 0;
342  }  }
343    
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