diff --git a/src/lib.zig b/src/lib.zig
index 4986926ecac1e4e12eaf4c456758af1852d75002..0acbd9132d5ba3ed3874532e0f36ab368401c083 100644
--- a/src/lib.zig
+++ b/src/lib.zig
@@ -478,3 +478,12 @@ pub fn sliceTo(comptime T: type, haystack: []const T, needle: T) []const T {
     }
     return haystack;
 }
+
+pub fn matchesAll(comptime T: type, haystack: []const u8, comptime needle: fn (T) bool) bool {
+    for (haystack) |c| {
+        if (!needle(c)) {
+            return false;
+        }
+    }
+    return true;
+}