prestashop 1.7.4.3 search not works for Chinese in front end

[Jack]

I cannot make search work in front end. After input some words and press enter, always no products found. Anyone else have the same issue using version 1.7.4.3? 

[jetway]

No, works good for me. However, did you index your products?

[Jack]

Yes, I did everything I find online to make it work, but failed.

[Jack]

After re-installed prestashop, I found the search function just works for English words, not for Chinese words. Anyone has an idea to fix it?

[Jack]

Finally found the reason and a workaround:

In classes/Search.php, in function sanitize() at about line 167,

$string = Tools::replaceAccentedChars(trim(preg_replace('/\s+/', ' ', $string)));

replace it with,

$string = Tools::replaceAccentedChars($string);

Then searching works with Chinese words.

Notes: my version is 1.7.4.3

[Jack]

Finally found the solution, just replace the line mentioned above with,

$string = Tools::replaceAccentedChars(trim(preg_replace('/[\pZ\pC]+/u', ' ', $string)));

Also, comment out lines about splitting symbols(also chinese characters) to single words, see attached file for details.

Then rebuild search index and everything will work.

Search.php

[David]

Instead of using PrestaShop default search I prefer to use the Search Module available at the Addon store. It provides more options to improve the search results, it works good for my store.