Merge pull request #65 from stclib/dev43

Dev43

1 files changed, 37 insertions, 0 deletions

diff --git a/misc/examples/regularexpressions/regex_match.c b/misc/examples/regularexpressions/regex_match.c
new file mode 100644
index 00000000..11426d2d
--- /dev/null
+++ b/misc/examples/regularexpressions/regex_match.c
@@ -0,0 +1,37 @@
+#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].str));
+
+    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);
+}