Update comments on ddusb-exclude.conf and regex in ddusb script

config/ddusb-exclude.conf

@@ -1,3 +1,4 @@
-## File for excluding particular files from being written to
-## Write one device per line, shell-style globs are accepted i.e. /dev/sda?
-## Lines beginning with "#" and ";" are ignored
+# File for excluding block devices from being written to
+# Write one device per line, shell-style globs are accepted i.e. /dev/sda*
+# Brace expansion is not supported
+# Lines beginning with "#" and ";" are ignored

ddusb.py

@@ -1,5 +1,5 @@
 #!/usr/bin/python3
-"""Write an ISO image to a usb drive using dd."""
+"""Wrapper script for using dd to write to a USB drive."""
 
 import argparse
 import glob
@@ -8,7 +8,7 @@ import re
 import subprocess
 
 # ========== Constants ==========
-COMMENT_PATTERN = "[#;]"
+COMMENT_PATTERN = "^[#;]"
 EXCLUDE_FILE = "/etc/helper-scripts/ddusb-exclude.conf"