fix: slash command params silently truncated at first line break

[dsaicharan072-cmyk]

The client-side parse() helper in processSlashCommand.ts used the regex /^/([^\s]+)(.)/ without the dotall flag. Because (.) stops at \n by default, any text typed after a Shift+Enter in the composer was silently dropped before it reached the command handler.

Fix: add the /s (dotall) flag so (.*) matches across newlines.

The server-side parser (apps/meteor/lib/utils/parseParameters.ts) already handles multi-line params correctly; this change makes the client-side path consistent with it.

Closes: #41324

Summary by CodeRabbit

• Bug Fixes

  • Fixed slash command parameters being truncated when the triggering message contains line breaks.
  • Multi-line and quoted parameters are now fully preserved and forwarded to the command handler.

• Tests

  • Added Jest coverage for single-line, multi-line, and quoted multi-line slash command parameters.

[dionisio-bot]

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[changeset-bot]

🦋 Changeset detected

Latest commit: 4adc251

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@rocket.chat/meteor	Patch
@rocket.chat/core-typings	Patch
@rocket.chat/rest-typings	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

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All committers have signed the CLA.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: eec71a98-39fc-45fb-a450-2b9ac5b6119e

📥 Commits

Reviewing files that changed from the base of the PR and between 3f0bb58 and 4adc251.

📒 Files selected for processing (1)

• .changeset/fix-slash-command-multiline-truncation.md

✅ Files skipped from review due to trivial changes (1)

• .changeset/fix-slash-command-multiline-truncation.md

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Walkthrough

The client slash-command parser now preserves parameters across newline characters. Tests verify single-line, multiline, and quoted multiline payloads, and a patch changeset documents the fix.

Changes

Multiline slash command parsing

Layer / File(s)	Summary
Enable multiline parameter capture apps/meteor/client/lib/chats/flows/processSlashCommand.ts	The parser regex now uses the dotall flag so command parameters include newline characters.
Validate command payload preservation apps/meteor/client/lib/chats/flows/processSlashCommand.spec.ts, .changeset/fix-slash-command-multiline-truncation.md	Tests verify complete single-line, multiline, and quoted multiline parameters in the REST request, while the changeset documents the patch release.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested labels: type: bug

Suggested reviewers: d-gubert, KevLehman, ggazzo

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main fix: preserving slash command params past the first line break.
Linked Issues check	✅ Passed	The dotall regex change and new test address the reported client-side truncation and match the issue requirements.
Out of Scope Changes check	✅ Passed	The changes are limited to the slash-command fix, its test, and a changeset note, with no unrelated code paths.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[cubic-dev-ai]

No issues found across 3 files

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