+#include <ccan/str_talloc/str_talloc.h>
+#include <ccan/str_talloc/str_talloc.c>
+#include <ccan/tap/tap.h>
+
+int main(int argc, char *argv[])
+{
+ void *ctx = talloc_init("toplevel");
+ unsigned int top_blocks = talloc_total_blocks(ctx);
+ char *a, *b;
+ /* If it accesses this, it will crash. */
+ char **invalid = (char **)1L;
+
+ plan_tests(25);
+ /* Simple matching. */
+ ok1(strreg(ctx, "hello world!", "hello") == true);
+ ok1(strreg(ctx, "hello world!", "hi") == false);
+
+ /* No parentheses means we don't use any extra args. */
+ ok1(strreg(ctx, "hello world!", "hello", invalid) == true);
+ ok1(strreg(ctx, "hello world!", "hi", invalid) == false);
+
+ ok1(strreg(ctx, "hello world!", "[a-z]+", invalid) == true);
+ ok1(strreg(ctx, "hello world!", "([a-z]+)", &a, invalid) == true);
+ /* Found string */
+ ok1(streq(a, "hello"));
+ /* Allocated off ctx */
+ ok1(talloc_find_parent_byname(a, "toplevel") == ctx);
+ talloc_free(a);
+
+ ok1(strreg(ctx, "hello world!", "([a-z]*) ([a-z]+)",
+ &a, &b, invalid) == true);
+ ok1(streq(a, "hello"));
+ ok1(streq(b, "world"));
+ ok1(talloc_find_parent_byname(a, "toplevel") == ctx);
+ ok1(talloc_find_parent_byname(b, "toplevel") == ctx);
+ talloc_free(a);
+ talloc_free(b);
+
+ /* * after parentheses returns last match. */
+ ok1(strreg(ctx, "hello world!", "([a-z])* ([a-z]+)",
+ &a, &b, invalid) == true);
+ ok1(streq(a, "o"));
+ ok1(streq(b, "world"));
+ talloc_free(a);
+ talloc_free(b);
+
+ /* Nested parentheses are ordered by open brace. */
+ ok1(strreg(ctx, "hello world!", "(([a-z]*) world)",
+ &a, &b, invalid) == true);
+ ok1(streq(a, "hello world"));
+ ok1(streq(b, "hello"));
+ talloc_free(a);
+ talloc_free(b);
+
+ /* Nested parentheses are ordered by open brace. */
+ ok1(strreg(ctx, "hello world!", "(([a-z]*) world)",
+ &a, &b, invalid) == true);
+ ok1(streq(a, "hello world"));
+ ok1(streq(b, "hello"));
+ talloc_free(a);
+ talloc_free(b);
+
+ /* NULL means we're not interested. */
+ ok1(strreg(ctx, "hello world!", "((hello|goodbye) world)",
+ &a, NULL, invalid) == true);
+ ok1(streq(a, "hello world"));
+ talloc_free(a);
+
+ /* No leaks! */
+ ok1(talloc_total_blocks(ctx) == top_blocks);
+ talloc_free(ctx);
+ talloc_disable_null_tracking();
+
+ return exit_status();
+}