lpil/rustexp

Combining Non-capturing groups and alternation causes a panic

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#11 opened on Apr 4, 2020

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Description

If I enter in the following regex and subject then the capture list on the right doesn't update and the javascript console reports a panic: Regex:

(?:a(b+)c)|(b+)d

Subject:

abc
bbd

This same regex and subject work as expected in the rust playground.

Either of (?:a(b+)c) or (b+)d work as expected in rustexp, and (?:a(b+)c)(b+)d even works too.

Contributor guide

Research direction
Trace the panic by inspecting the regex compilation path and compare with the Rust playground to isolate if the error originates from the WASM build or the UI layer.
Tech stack
rust
Domain
backendtooling
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
RustRegular Expressions
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60