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#define i_extern
#include <stc/cregex.h>
#include <stc/csview.h>
bool add_10_years(int i, csview match, cstr* out) {
if (i == 1) { // group 1 matches year
int year;
sscanf(match.str, "%4d", &year); // scan 4 chars only
cstr_printf(out, "%04d", year + 10);
return true;
}
return false;
}
int main()
{
const char* pattern = "\\b(\\d\\d\\d\\d)-(1[0-2]|0[1-9])-(3[01]|[12][0-9]|0[1-9])\\b";
const char* input = "start date: 2015-12-31, end date: 2022-02-28";
cstr str = {0};
cregex re = {0};
c_defer(
cregex_drop(&re),
cstr_drop(&str)
){
printf("INPUT: %s\n", input);
/* replace with a fixed string, extended all-in-one call: */
cstr_take(&str, cregex_replace_pattern(pattern, input, "YYYY-MM-DD"));
printf("fixed: %s\n", cstr_str(&str));
/* US date format, and add 10 years to dates: */
cstr_take(&str, cregex_replace_pattern(pattern, input, "$1/$3/$2", 0, add_10_years, CREG_DEFAULT));
printf("us+10: %s\n", cstr_str(&str));
/* Wrap first date inside []: */
cstr_take(&str, cregex_replace_pattern(pattern, input, "[$0]"));
printf("brack: %s\n", cstr_str(&str));
/* Shows how to compile RE separately */
re = cregex_from(pattern);
if (cregex_captures(&re) == 0)
continue; /* break c_defer */
/* European date format. */
cstr_take(&str, cregex_replace(&re, input, "$3.$2.$1"));
printf("euros: %s\n", cstr_str(&str));
/* Strip out everything but the matches */
cstr_take(&str, cregex_replace_sv(&re, csview_from(input), "$3.$2.$1;", 0, NULL, CREG_R_STRIP));
printf("strip: %s\n", cstr_str(&str));
/* Wrap all words in ${} */
cstr_take(&str, cregex_replace_pattern("[a-z]+", "52 apples and 31 mangoes", "$${$0}"));
printf("curly: %s\n", cstr_str(&str));
}
}
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