1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
|
#define i_import
#include <stc/cregex.h>
#define i_implement
#include <stc/csview.h>
#define i_key float
#include <stc/cstack.h>
int main(void)
{
// 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.";
cregex re = {0};
cstack_float vec = {0};
const char* pattern = "[+-]?([0-9]*\\.)?\\d+([Ee][+-]?\\d+)?";
int res = cregex_compile(&re, pattern);
printf("%d: %s\n", res, pattern);
// extract and convert all numbers in str to floats
c_formatch (i, &re, str)
cstack_float_push(&vec, (float)atof(i.match[0].buf));
c_foreach (i, cstack_float, vec)
printf(" %g\n", (double)*i.ref);
// extracts the numbers only to a comma separated string.
cstr nums = cregex_replace_sv(&re, csview_from(str), " $0,", 0, NULL, CREG_STRIP);
printf("\n%s\n", cstr_str(&nums));
cstr_drop(&nums);
cregex_drop(&re);
cstack_float_drop(&vec);
}
|
