Feature: Add "Match contains" dropdown option for substring search

[anthony-tom1]

Files Changed

Theme:
vendor/nodebb-theme-harmony-main/templates/search.tpl
vendor/nodebb-theme-harmony-2.1.35/templates/search.tpl

Language:
public/language/en-US/search.json - en-US language
public/language/en-GB/search.json - en-GB language

Core:
src/search.js

Plugin (node_modules):
node_modules/nodebb-plugin-dbsearch/lib/mongo.js
node_modules/nodebb-plugin-dbsearch/lib/postgres.js
node_modules/nodebb-plugin-dbsearch/lib/redis.js

Description

• Adds a third case-insensitive search mode, "Match contains", to the advanced search dropdown so users can search by substring (e.g. “lo wo” matches “Hello World!”).
• Previously only “Match all words” and “Match any word” dropdown options were available.
• Redis search is word-based and does not support substring search. For the new “Match contains” mode, the plugin gets candidate IDs from the index (using only category and user filters when present, otherwise from the full index set). It loads post and topic content via NodeBB’s posts and topics modules, filters by case-insensitive substring in application code, applies filters and result limit, and returns the result list.
• In public/language/en-US/search.json and public/language/en-GB/search.json the key match-contains was added with the value "Match contains". The advanced search template uses [[search:match-contains]], so the dropdown label is taken from these files.

Feature Demo
Screenshots showing "Match contains" search in local NodeBB server.

[coveralls]

Pull Request Test Coverage Report for Build 21806329526

Details

• 0 of 5 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.01%) to 78.828%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/search.js	0	5	0.0%

Totals
Change from base Build 21804929697:	-0.01%
Covered Lines:	25357
Relevant Lines:	30331

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💛 - Coveralls