Fix TAG field search with special characters in doctest

[Copilot]

Problem

The doctest in doctests/query-em.js (test case em3) was incorrectly demonstrating how to search for email addresses in TAG fields. The test was wrapped in a try-catch block that printed "'test@redis.com' syntax not yet supported", giving the false impression that searching TAG fields with special characters is unsupported functionality.

Root Cause

The original code attempted to search using:

const res6 = await client.ft.search('idx:email', 'test@redis.com', { DIALECT: 2 });

This fails because:

1. Special characters like @ and . must be escaped when searching TAG field values
2. The query syntax must explicitly specify the field: @fieldname:{value}

According to Redis documentation, punctuation characters in TAG fields require proper escaping.

Solution

Updated the test to use the correct pattern already demonstrated in examples/search-json.js:

// Escape special characters (. and @) in the email address for TAG field search
const emailAddress = 'test@redis.com'.replace(/[.@\\]/g, '\\$&');
const res6 = await client.ft.search('idx:email', `@email:{${emailAddress}}`);
console.log(res6.total); // >>> 1

Changes

• Removed the misleading try-catch block
• Added proper special character escaping for TAG field values
• Used correct query syntax with field specifier
• Added assertion to verify the search returns the expected result
• Added explanatory comment about the escaping requirement

This converts a failing test that was hiding behind error handling into properly working documentation that demonstrates the correct usage pattern.

Original prompt

find an issue and lets see if you can fix it

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