I don't understand Case- and diacritics sensitivity

[fishfree]

The doc here says:

- sensitive or s: case+diacritics sensitive only
- insensitive or i: case+diacritics insensitive only
- sensitive_insensitive or si: case+diacritics sensitive and insensitive
- all: all four combinations of case-sensitivity and diacritics-sensivity

My understanding is as below:

• sensitive or s: case+diacritics are both sensitive only
• insensitive or i: case+diacritics are both insensitive only
• sensitive_insensitive or si: case is sensitive and diacritics is insensitive
• all: I don't understand totally :-(

Am I right?

[jan-niestadt]

sensitive_insensitive means two versions of your input docs will be indexed:

• one that's both case-sensitive AND diacritics-sensitive
• one that's both case-insensitive AND diacritics-insensitive

all would index all 4 combinations, i.e. CD, cd, Cd, cD (where C mean case-sensitive, c case-insensitive, etc.) and would allow you to search case-insensitively but diacritics-sensitively.

all is not well support yet by BlackLab, however. We don't currently use it, and I'm not sure if it works at all. Pull requests welcome, and I'd be happy to give you some pointers where to start if you want.