pat: remove limit of one * in shell style

[timbray]

Note that this is a semantic change so will lead to release 1.1.0.

[timbray]

The CI is breaking because "package slices is not in GOROOT". I just introduced slices in a test so I could use slices.Contains. I could easily take slices out and write my own "contains" method in about 3 minutes but I'm reluctant to do that without understanding what's going on. Is the "slices" package magically weird? Hey @embano1, any ideas?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.54%. Comparing base (e415ed3) to head (ee93bb5).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #320      +/-   ##
==========================================
+ Coverage   96.10%   96.54%   +0.44%     
==========================================
  Files          18       18              
  Lines        1744     1735       -9     
==========================================
- Hits         1676     1675       -1     
+ Misses         40       35       -5     
+ Partials       28       25       -3     

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[timbray]

OK, fairly obvious that nobody wants to review PRs that dive deep into finite-automaton wrangling. Will merge. Next PR is about getting numeric matching right, which at least is user-visible.