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   regerror.3p    ( 3 )

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Примеры (Examples)

#include <regex.h>

           /*
            * Match string against the extended regular expression in
            * pattern, treating errors as no match.
            *
            * Return 1 for match, 0 for no match.
            */

           int
           match(const char *string, char *pattern)
           {
               int    status;
               regex_t    re;

               if (regcomp(&re, pattern, REG_EXTENDED|REG_NOSUB) != 0) {
                   return(0);      /* Report error. */
               }
               status = regexec(&re, string, (size_t) 0, NULL, 0);
               regfree(&re);
               if (status != 0) {
                   return(0);      /* Report error. */
               }
               return(1);
           }

       The following demonstrates how the REG_NOTBOL flag could be used
       with regexec() to find all substrings in a line that match a
       pattern supplied by a user.  (For simplicity of the example, very
       little error checking is done.)

           (void) regcomp (&re, pattern, 0);
           /* This call to regexec() finds the first match on the line. */
           error = regexec (&re, &buffer[0], 1, &pm, 0);
           while (error == 0) {  /* While matches found. */
               /* Substring found between pm.rm_so and pm.rm_eo. */
               /* This call to regexec() finds the next match. */
               error = regexec (&re, buffer + pm.rm_eo, 1, &pm, REG_NOTBOL);
           }