Index: src/0dev.org/parse/parse.go
==================================================================
--- src/0dev.org/parse/parse.go
+++ src/0dev.org/parse/parse.go
@@ -88,9 +88,25 @@
 		if !n.Matched {
 			return n, s
 		}
 		if n.Content == value {
 			return n, r
+		}
+		return N{Matched: false, Content: "", Nodes: []N{n}}, s
+	}
+}
+
+// Returns a parser that matches any single digit
+// It could have been written as Any(String("0"),String("1"),...,String("9")) as well :)
+func Digit() P {
+	accept := Accept(1)
+	return func(s string) (N, string) {
+		n, r := accept(s)
+		if !n.Matched {
+			return n, s
+		}
+		if n.Content[0] >= 48 && n.Content[0] <= 57 {
+			return n, r
 		}
 		return N{Matched: false, Content: "", Nodes: []N{n}}, s
 	}
 }

Index: src/0dev.org/parse/parse_test.go
==================================================================
--- src/0dev.org/parse/parse_test.go
+++ src/0dev.org/parse/parse_test.go
@@ -74,5 +74,15 @@
 	}
 	if n, r := s("ab"); n.Matched || n.Content != "" || n.Nodes == nil || r != "ab" {
 		t.Error("Invalid result for String no-match test", n, r, len(r))
 	}
 }
+
+func TestDigit(t *testing.T) {
+	d := Digit()
+	if n, r := d("a"); n.Matched || n.Content != "" || n.Nodes == nil || r != "a" {
+		t.Error("Invalid result for Digit no-match test", n)
+	}
+	if n, r := d("1"); !n.Matched || n.Content != "1" || n.Nodes != nil || r != "" {
+		t.Error("Invalid result for Digit match test", n)
+	}
+}