Windows: scip-python crashes on startup due to unescaped path.sep in RegExp #210

Summary

scip-python index crashes on Windows before indexing starts because path.sep is used directly in new RegExp(...).

On Windows, path.sep === \, so this produces an invalid regular expression:

Invalid regular expression: /\\/g: \\ at end of pattern

Repro

Environment:

• Windows 11
• Node.js 24.12.0
• @sourcegraph/scip-python@0.6.6

Command:

scip-python index --cwd D:\\Development\\Prompsit\\prompsit-api --project-name prompsit-api

Observed stack trace points to packages/pyright-scip/src/virtualenv/PythonEnvironment.ts:

const pathSepRegex = new RegExp(path.sep, 'g');

Expected

scip-python should index successfully on Windows.

Root Cause

path.sep must be escaped before it is used as a regex pattern.

Proposed Fix

Replace:

const pathSepRegex = new RegExp(path.sep, 'g');

with an escaped variant, for example:

const pathSepRegex = new RegExp(path.sep.replace(/[-/\\^$*+?.()|[\]{}]/g, '\\$&'), 'g');

I have locally verified that this removes the Windows crash and allows scip-python index to complete on a real project.