An NFA-based regex engine with a library and command-line tool.

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Aadhavan Srinivasan 360bdc8e11 Big rewrite - assertion handling, zero-match fixes, change in recursive calls ... I added support for transitions. I wrote a function to determine if a given state has transitions for a character at a given point in the string. This helps me check if the current state has an assertion, and take actions based on that. I also fixed zero-length matching (almost, see todo.txt). It works for nearly all cases I could think of, although I still need to write more tests. I wrote a function to check if zero-length matches are possible with a given state. I also changed the way recursive calls work. Rather than passing a modified string, the function stores the location in the input string. This location is updated with each call to the function. Finally, the function now increments the offset by 1 instead of incrementing by the length of the longest match. This leads to a bit of overhead eg. if a regex matches index 1-5, then 1-5, 2-5, 3-5, 4-5 are all stored. To fix this, I wrote (and used) a function to check if a match overlaps with any matches in a slice.		8 months ago
.gitignore	Added gitignore	8 months ago
Makefile	Disable compile-time optimization	8 months ago
go.mod	More Kleene star fixes	8 months ago
go.sum	Print matched content in color	8 months ago
main.go	Added support for detecting assertion characters; changed input so that newline isn't required	8 months ago
matching.go	Big rewrite - assertion handling, zero-match fixes, change in recursive calls	8 months ago
misc.go	Added constants for LBRACKET and RBRACKET	8 months ago
nfa.go	Use stateContents type to allow a state to store multiple characters	8 months ago
postfixNode.go	Wrote function to provide correct node for escaped character	8 months ago
re_test.go	Added more test cases	8 months ago
sliceQueue.go	Added 'mustPop' function which panics if slice is empty	8 months ago
stateContents.go	Added more functions to stateContents type, removed append because I don't think I need it	8 months ago
todo.txt	Updated TODO	8 months ago