runtime error: index out of range [<number>] with length <samenumber> about regexp2

[dlclark]

Oddly enough I think this one is related to #34. The ()+? construct generates a state machine that ends up with a corrupt stack. I suspect the Lazybranchmark operation isn't handling the scenario when we have an empty group with a lazy repeat.

Sometimes the out-of-sync stack leads to bad match groups being created (in the case of #34), sometimes it causes bad jumps (these two examples), and sometimes it just fails silently and leaves extra items on the stack.

We'll see if Microsoft can figure out the right change...otherwise I'll take a look at it.

[gandarez]

It's still happening in a production code with this pattern ((?:[\w*\s])+?(?:\s|[*]))([a-zA-Z_]\w*)(\s*\([^;]*?\))([^;{]*)(\{). Any update on this?

[dlclark]

@gandarez What exact input and options cause the pattern to panic? It'd help to have a simple test reproducing the problem.

[gandarez]

It supposed to happen at this pattern because you mentioned this piece ()+?. I can't show the code is causing it because wakatime-cli uses a 3rd party library called chroma that relies on regexp2.