Add starts_with_all_of(), starts_with_any_of(), starts_with_none_of()

Author: martinmoene

README.md

@@ -121,6 +121,9 @@ The following table presents types, values and simplified, short prototypes of t
 |              | bool **contains_none_of**(string_view sv, string_view set)                         | true if string contains no character of set                                                       |
 |              |                                                                               |                                                                                              |
 |  starts_with | bool **starts_with**(string_view sv, string_view what)                             | true if string starts with given string                                                           |
+|              | bool **starts_with_all_of**(string_view sv, string_view set)                       | true if string starts with all characters of set                                                  |
+|              | bool **starts_with_any_of**(string_view sv, string_view set)                       | true if string starts with any character of set                                                   |
+|              | bool **starts_with_none_of**(string_view sv, string_view set)                      | true if string starts with no character of set                                                    |
 |              |                                                                               |                                                                                              |
 |  ends_with   | bool **ends_with**(string_view sv, string_view what)                               | true if string ends with given string                                                             |
 |              |                                                                               |                                                                                              |