fix: update unEscapeSpecialChars to use regex for unescaping special …

[Abhiiishek44]

Description

This PR fixes metadata parsing in the Redis vector store when stored metadata contains RediSearch-reserved special characters.

The current unEscapeSpecialChars implementation only removes escaping from hyphens. Other escaped characters, including colons and quotes, remain unchanged when metadata is retrieved. Since the metadata is later passed to JSON.parse(), these remaining escape characters can cause parsing to fail during similarity search.

The unescaping logic has been updated to handle all supported RediSearch-reserved characters instead of handling only hyphens. Unrelated backslashes are preserved so that normal string content is not modified.

Changes

• Updated unEscapeSpecialChars in the Redis vector store utilities
• Added support for escaped RediSearch-reserved characters
• Preserved unrelated backslashes
• Kept the change limited to Redis metadata deserialization

Impact

Redis vector store results containing metadata with characters such as :, ", -, and other reserved characters can now be parsed correctly without affecting existing metadata values.

Fixes #6598

[gemini-code-assist]

Code Review

This pull request updates the unEscapeSpecialChars utility function in the Redis vector store component to unescape a broader set of special characters using a regular expression. The review feedback correctly identifies a critical issue where including double quotes in the character class can corrupt JSON-escaped strings and cause syntax errors during parsing, and provides a code suggestion to exclude double quotes from the regex.

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