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#define i_extern
#include <stc/cregex.h>
#include <stc/csview.h>
#define i_val float
#include <stc/cstack.h>
int main()
{
// Lets find the first sequence of digits in a string
const char *str = "Hello numeric world, there are 24 hours in a day, 3600 seconds in an hour."
" Around 365.25 days a year, and 52 weeks in a year."
" Boltzmann const: 1.38064852E-23, is very small."
" Bohrradius is 5.29177210903e-11, and Avogadros number is 6.02214076e23.";
c_auto (cregex, re)
c_auto (cstack_float, vec)
c_auto (cstr, nums)
{
const char* pattern = "[+-]?([0-9]*\\.)?\\d+([Ee][+-]?\\d+)?";
int res = cregex_compile(&re, pattern, CREG_DEFAULT);
printf("%d: %s\n", res, pattern);
// extract and convert all numbers in str to floats
c_formatch (i, &re, str)
cstack_float_push(&vec, atof(i.match[0].str));
c_foreach (i, cstack_float, vec)
printf(" %g\n", *i.ref);
// extracts the numbers only to a comma separated string.
nums = cregex_replace_sv(&re, csview_from(str), " $0,", 0, NULL, CREG_R_STRIP);
printf("\n%s\n", cstr_str(&nums));
}
}
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