diff --git a/site_ansto/instrument/util/gen_sct.py b/site_ansto/instrument/util/gen_sct.py
index 3381f3dd..b77a2b56 100755
--- a/site_ansto/instrument/util/gen_sct.py
+++ b/site_ansto/instrument/util/gen_sct.py
@@ -216,12 +216,12 @@ def t_tcl_error(t):
     t.lexer.skip(1)
 
 def t_TEXT_STRING1(t):
-    r'\'[^\']+\''
+    r'\'[^\']*\''
     t.value = t.value[1:-1]
     return t
 
 def t_TEXT_STRING2(t):
-    r"\"[^\"]+\""
+    r"\"[^\"]*\""
     t.value = t.value[1:-1]
     return t