don't copy regex match strings

[stevengj]

Closes #14

[stevengj]

Requires Julia 1.6 for JuliaLang/julia#38108 … probably not worth it nowadays to worry about backporting this.

[codecov-commenter]

Codecov Report

Merging #15 (04f6bee) into main (7c7f0b6) will decrease coverage by 5.85%.
The diff coverage is 20.00%.

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@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
- Coverage   75.05%   69.21%   -5.85%     
==========================================
  Files           6        6              
  Lines         417      458      +41     
==========================================
+ Hits          313      317       +4     
- Misses        104      141      +37     

Flag	Coverage Δ
unittests	69.21% <20.00%> (-5.85%)	⬇️

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Impacted Files	Coverage Δ
src/search.jl	44.15% <0.00%> (-5.12%)	⬇️
src/regex.jl	62.00% <17.14%> (-24.77%)	⬇️
src/StringViews.jl	96.87% <66.66%> (+0.04%)	⬆️
src/decoding.jl	86.36% <100.00%> (ø)

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