Now with more weirdness.

xplace/x.py

@@ -17,7 +17,7 @@ parser = Lark(r'''
                 | //
 
        numrange : DIGITS
-                | DIGITS "-" DIGITS
+                | DIGITS "-" DIGITS [ "*" DIGITS ] [ "+" DIGITS ]
 
           ?unit : parens | brackets | char
    ?concat_func : unit
@@ -125,6 +125,12 @@ class Expand(Transformer):
             b = a
         else:
             b = int(args[1].value)
+        m = 1
+        if len(args) >= 3:
+            m = int(args[2].value)
+        p = 0
+        if len(args) >= 4:
+            p = int(args[3].value)
         while a < b:
             result.append(a)
             a += 1
@@ -132,7 +138,7 @@ class Expand(Transformer):
             result.append(a)
             a -= 1
         result.append(a)
-        return result
+        return [ x * m + p for x in result ]
 
     def index(self, args):
         result, x = [], args[0]