Normalizing Keywords Bug The StringHelper::normalizeKeywords() doesn't work as I expected.

When I normalize überblick it leads to the expected result:

StringHelper::normalizeKeywords('überblick') -&gt; ueberblick


But when I normalize ÜBERBLICK I expect it also to be ueberblick but it actually returns überblick.

It could be fixed by adding the missing ASCII mappings (e.g. 196 => 'Ae') to the StringHelper::getAsciiCharMap() method or converting the string to lowercase before replacing the characters in StringHelper::normalizeKeywords() on lines 358 - 362:

-&gt; switch these two lines:

// Remove punctuation and diacritics
$str = strtr($str, static::_getCharMap());

// Normalize to lowercase
$str = StringHelper::toLowerCase($str);
This may be a bug, and is probably worth reporting to P&amp;T.

However, it's very difficult (if not impossible) for them to account for every potential ASCII character mapping for every possible language. For that reason, there is a customAsciiCharMappings config setting, which you can use as a workaround.