diff --git a/lib/cmxl/field.rb b/lib/cmxl/field.rb
index 5bfad11..24a5d50 100644
--- a/lib/cmxl/field.rb
+++ b/lib/cmxl/field.rb
@@ -47,7 +47,7 @@ class << self
     # Cmxl::Field.parse(':60F:C031002PLN40000,00') #=> returns an AccountBalance instance
     #
     def self.parse(line)
-      if line =~ /\A:(\d{2,2})(\w)?:(.*)\z/m
+      if line =~ /\A:(\w{2,2})(\w)?:(.*)\z/m
         tag = Regexp.last_match(1)
         modifier = Regexp.last_match(2)
         content = Regexp.last_match(3).delete("\r").gsub(/\n\z/, '') # remove trailing line break to prevent empty field parsing