index_of

Finds the leftmost occurrence of the given string.

Example: Find the leftmost occurrence of the given string:

public static int main (string[] args) {
	string haystack = "Tell me on the way Brigadier! Tell me on the way!";
	string needle = "Tell me";
	int index = -1;

	// Output: ``0``
	index = haystack.index_of (needle);
	print ("%d\n", index);

	// Output: ``30``
	index = haystack.index_of (needle, 5);
	print ("%d\n", index);

	// Output: ``-1``
	index = haystack.index_of ("NOT-AVAILABLE", 5);
	print ("%d\n", index);

	// Output: ``0 30 -1``
	index = 0;
	do {
		index = haystack.index_of (needle, index);
		print ("%d ", index);
	} while (index++ >= 0);
	print ("\n");

	return 0;
}

valac --pkg glib-2.0 string.index_of.vala

Parameters:

needle	a string
start_index	the starting position for the search in bytes.

Returns:

the byte index of the first occurrence of the string, or -1 if the string does not occur.