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#include <pcre.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
/* sample program that matches input against several regex's,
* extracts captured subpatterns. compile with -lpcre and test with:
*
* ./template one,two,three abc123
*
*/
#define OVECLEN 30 /* must be multiple of three. */
typedef struct {
char *regex;
pcre *re;
pcre_extra *x;
} regex_t;
regex_t rexes[] = {
{.regex = "abc(\\d+)", },
{.regex = "^(\\w+),(\\w+),(\\w+)$", },
};
int main(int argc, char *argv[]) {
int i,j, ovec[OVECLEN], rc; regex_t *r;
/* for pcre to report compilation errors back to us */
const char *err;
int off;
for(i=0; i < sizeof(rexes)/sizeof(*rexes); i++) {
r = &rexes[i];
/* compile the regular expression */
r->re = pcre_compile(r->regex, 0, &err, &off, NULL);
if (r->re == NULL) {
fprintf(stderr,"error %s in pattern %s at %u\n", err, r->regex, off);
exit(-1);
}
/* optional: study the pattern */
r->x = pcre_study(r->re, 0, &err);
if (err) {
fprintf(stderr,"study of %s failed: %s\n", r->regex, err);
exit(-1);
}
}
/* now we loop over some input and test the regex */
for(i=0; i < argc; i++) {
for(j=0; j < sizeof(rexes)/sizeof(*rexes); j++) {
r = &rexes[j];
rc = pcre_exec(r->re, r->x, argv[i], strlen(argv[i]), 0, 0, ovec, OVECLEN);
if (rc >= 0) {
printf("%s matches %s: first capture %.*s\n", argv[i], r->regex,
ovec[3]-ovec[2], &argv[i][ovec[2]]);
}
}
}
}
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