Add unpack for RegexMatch

[jonas-schulze]

This makes it handy to unpack named capture groups from a regex match.

[mauro3]

Cool, thanks!

I don't use regex much at all. What's your take: is this a complete implementation or will I be chasing edge cases till the end of my life?

[codecov-commenter]

Codecov Report

Merging #16 (ed242d0) into master (e4bb4b3) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #16   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           31        32    +1     
=========================================
+ Hits            31        32    +1     

Impacted Files	Coverage Δ
src/UnPack.jl	100.00% <100.00%> (ø)

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[jonas-schulze]

The honest answer would be that I don't know; I'm not an expert in Perl-compatible regular expressions. On the flip side, being PCRE and being included in the Julia documentation, among other parts

Captures can also be accessed by indexing the RegexMatch object with the number or name of the capture group:

julia> m=match(r"(?<hour>\d+):(?<minute>\d+)","12:45")
RegexMatch("12:45", hour="12", minute="45")

julia> m[:minute]
"45"

julia> m[2]
"45"

I'd say this is fairly stable and the implementation is complete.