Solarium version(s) affected: 6.3.*
Solr version: all
Solr mode: standalone / cloud

Description
A term containing words and,or,to in lowercase are considered as AND OR TO solr operator.
Why is there a strtoupper before preg_match.
The term must contain upper AND OR TO, lower is not a problem!

Core/Query/Helper.php

public function escapeTerm(string $input): string
    {
        if (preg_match('/(^|\s)(AND|OR|TO)($|\s)/', strtoupper($input), $matches)) {
            return $this->escapePhrase($input);
        }

        return preg_replace('/( |\+|-|&&|\|\||!|\(|\)|\{|}|\[|]|\^|"|~|\*|\?|:|\/|\\\)/', '\\\$1', $input);
    }

How to reproduce
Use a term with "foo and bar"

Possible Solution
Suppress strtoupper in preg_match call.

Additional context