bash – Glob and regex matching

Bash has two types of pattern matching, Glob and Regex. The general rule of usage seems to be that 1) the simpler glob is done to search filenames 2) regex is used for searching text.

Glob uses the metacharacters at the front, regex uses the metacharacters at the end of the pattern.

Glob          Regex
?(pattern)    (pattern)?
*(pattern)    (pattern)*     
+(pattern)    (pattern)+    

I therefore have difficulty understanding how file matching with wildcards (e.g. *.sh). Are wildcards something different than glob patterns? From what I see, the search pattern *.sh does not include a metacharacter to match any character after *.