TYPO3 Core

I wonder why your workaround works.

I have the same problem and investigated it: if mysql full text search is disabled, the indexer builds an index by populating index_word table, but it seems the Lexer removes the hyphen completely in line 149:

foreach ($this->lexerConf['removeChars'] as $skipJoin) {
       $theWord = str_replace($this->csObj->UnumberToChar($skipJoin), '', $theWord);
}

I checked older versions of TYPO3 and never found any word with a hyphen in word_index.

I have no clue why the hyphen is replaced, maybe since it appears in english quite rare and mostly to divide words at line breaks?

Ok, I found why it works if the mysql driver is not used: the hyphen in the search word is also removed when comparing

I just tried a little test with 8.7.9 (note: indexed_search_mysql has been removed)

- installed indexed_search, frontend indexing:yes
- create a page with "eq-5d" in the title
- create a content element with "eq-5d" in the text
- visited the pages to index them

both were found

Patch set 1 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/71885

Patch set 2 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/71885

Patch set 3 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/71885

Patch set 4 for branch main of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/71885

Patch set 1 for branch 11.5 of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/75146