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Parses and executes substitute expressions (subexes)
So far subex has the following operations:
- Concatenation of a and b with ab
- Or with |
- Repeat maximally with *
- Repeat minimally with -
- Copy a specific character 'a'
- Copy any character '.'
- Store text matching a regex into slot 's': `$s(regex)`
- Output text in "" including loading from slots with '$'
Regexes support all the same operations as subexes minus storing and outputting
This first implementation gives very little thought to efficiency
Example:
./main 'according to all known laws of aviation' '$1(.-)$m(( .* )| ).*"$m$1"'
This swaps the first and last words of the input string
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