Background

SERVER-125834 identified and fixed a spurious trailing / in $regularExpression.pattern values across the query-correctness-tests-4 reference files (merged as query-correctness-tests-4 PR #22). The root cause was an off-by-one in ValueWriter::toRegEx():

{{// BUG: rfind('/') returns an index, but substr() takes a length.
// Passing the index as the length includes the closing '/' delimiter.
return JSRegEx(regexStr.substr(1, regexStr.rfind('/')), // off by one
regexStr.substr(regexStr.rfind('/') + 1));}}
For /SMS/ this produced "pattern":"SMS/" instead of "pattern":"SMS". Fixed in mongo PR #52547 (SERVER-116052) by switching to JS::GetRegExpSource / JS::GetRegExpFlags.

Problem

The Evergreen patch run for SERVER-116052 (version 6a074f5f0f996d0007cb24f3) shows that query-correctness-tests-1, query-correctness-tests-2, and query-correctness-tests-3 all have the same trailing-slash bug in their reference files — every .results file where a $function expression returns a regex literal has an extra / in the "pattern" field. With the fix now active in the WASM engine, the corrected output no longer matches these stale references, causing ~50 failures per bucket (150 failures total).

Fix

For each of query-correctness-tests-1, query-correctness-tests-2, query-correctness-tests-3:

1. Run the fix script (checked in at src/mongo/db/query/query_tester/tests/scripts/fix_regex_trailing_slash.py) against the repo to remove the trailing / from every "pattern" field value.
2. Commit and open a PR on each corpus repo.
3. After merge, bump the corresponding commit hash in src/mongo/db/query/query_tester/tests/test_repos.conf in 10gen/mongo.

Acceptance Criteria

• All query_correctness_generated_test_1/2/3 Evergreen tasks are green on an --//bazel/config:js_engine=wasm patch build.
• No changes to .test or .coll files — only .results files are affected.