Fixed multiplication sign in preprocessor for usage of square brackets.

src/parser.py

@@ -162,15 +162,16 @@ class Parser(BisonParser):
         #   - "4a" with "4*a".
         #   - "a4" with "a^4".
 
-        pattern = ('(?:(\))\s*(\()'                       # )(  -> ) * (
-                + '|(\))\s*(\[)'                          # )[  -> ) * [
-                + '|([\x00-\x09\x0b-\x19a-z0-9])\s*(\()'  # a(  -> a * (
-                + '|(\))\s*([\x00-\x09\x0b-\x19a-z0-9])'  # )a  -> ) * a
+        pattern = ('(?:(\))\s*(\(|\[)'                       # )(  -> ) * (
+                                                             # )[  -> ) * [
+                + '|([\x00-\x09\x0b-\x19a-z0-9])\s*(\(|\[)'  # a(  -> a * (
+                                                             # a[  -> a * [
+                + '|(\))\s*([\x00-\x09\x0b-\x19a-z0-9])'     # )a  -> ) * a
                 + '|([\x00-\x09\x0b-\x19a-z])\s*'
-                  + '([\x00-\x09\x0b-\x19a-z])'           # ab  -> a * b
-                + '|([0-9])\s*([\x00-\x09\x0b-\x19a-z])'  # 4a  -> 4 * a
-                + '|([\x00-\x09\x0b-\x19a-z])\s*([0-9])'  # a4  -> a ^ 4
-                + '|([0-9])\s+([0-9]))'                   # 4 4 -> 4 * 4
+                  + '([\x00-\x09\x0b-\x19a-z])'              # ab  -> a * b
+                + '|([0-9])\s*([\x00-\x09\x0b-\x19a-z])'     # 4a  -> 4 * a
+                + '|([\x00-\x09\x0b-\x19a-z])\s*([0-9])'     # a4  -> a ^ 4
+                + '|([0-9])\s+([0-9]))'                      # 4 4 -> 4 * 4
                 )
 
         def preprocess_data(match):