refactor: try_parse_re for repetition logic

[yuanbohan]

what's included

• make escaping { for repetition logic cleaner, and only try_parse_re when Err happens
• bump version to 0.3.1
• clippy including tests

cc @fbs

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6d752e7) 98.90% compared to head (c021908) 98.90%.

Changes have been made to critical files, which contain lines commonly executed in production. Learn more

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
- Coverage   98.90%   98.90%   -0.01%     
==========================================
  Files          14       14              
  Lines        6215     6202      -13     
==========================================
- Hits         6147     6134      -13     
  Misses         68       68              

Files	Coverage Δ
src/label/matcher.rs	100.00% <100.00%> (ø)
src/parser/ast.rs Critical	97.88% <100.00%> (ø)
src/parser/lex.rs Critical	98.02% <100.00%> (-0.02%)	⬇️
src/parser/parse.rs Critical	100.00% <100.00%> (ø)
src/parser/token.rs	100.00% <100.00%> (ø)
src/util/number.rs	100.00% <100.00%> (ø)

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[fbs]

Looks good :)

[evenyag]

LGTM