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// This is from// http://pic.dhe.ibm.com/infocenter/iseries/v7r1m0/index.jsp?topic=%2Frtref%2Fregexec.htm
#include <regex.h>
#include <stdio.h>
#include <stdlib.h>
int main(void) {
regex_t preg;
const char *string = "a very simple simple simple string";
const char *pattern = "\\(sim[a-z]le\\) \\1";
int rc;
size_t nmatch = 2;
regmatch_t pmatch[2];
if (0 != (rc = regcomp(&preg, pattern, 0))) {
printf("regcomp() failed, returning nonzero (%d)\n", rc);
exit(EXIT_FAILURE);
}
if (0 != (rc = regexec(&preg, string, nmatch, pmatch, 0))) {
printf("Failed to match '%s' with '%s',returning %d.\n", string, pattern,
rc);
} else {
printf(
"With the whole expression, "
"a matched substring \"%.*s\" is found at position %d to %d.\n",
pmatch[0].rm_eo - pmatch[0].rm_so, &string[pmatch[0].rm_so],
pmatch[0].rm_so, pmatch[0].rm_eo - 1);
printf(
"With the sub-expression, "
"a matched substring \"%.*s\" is found at position %d to %d.\n",
pmatch[1].rm_eo - pmatch[1].rm_so, &string[pmatch[1].rm_so],
pmatch[1].rm_so, pmatch[1].rm_eo - 1);
}
regfree(&preg);
return 0;
}
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