notes: add Pattern Matching section

NOTES.md

@@ -242,7 +242,30 @@ When a pattern is used for filename expansion, the character '.' at the start of
 a filename or immediately following a slash must be matched explicitly. In order
 to match the filenames '.' and '..', the pattern must begin with '.'
 
+When matching a filename, the slash character must always be matched explicitly
+by a slash in the pattern.
 
+##### Pattern Matching
+cf. 3.5.8.1 Pattern Matching
+
+Any character that appears in a pattern, other than the special pattern
+characters described below, matches itself.  The NUL character may not occur in
+a pattern. 
+
+The special pattern characters have the following meanings:
+'\*'
+Matches any string, including the null string.
+
+The special pattern characters must be quoted if they are to be matched
+literally.
+
+e.g. this is the required behaviour
+```shell
+bash-5.1$ ls *there
+'hello*there'  'hi*there'   noonethere
+bash-5.1$ ls *'*'there
+'hello*there'  'hi*there'
+```
 
 #### Quote Removal
 TODO