We have a filter field_contains: "something" which matches any entity whose field contains the string "something". The comparison for that is case sensitive. It would be good to also have a filter for string containment that is not case sensitive.

• Change _contains _starts_with, _ends_with functionality to be case insensitive #3116
• Add new filters for case sensitive match _contains_strict , _starts_with_strict, _ends_with_strict #3117
• Add new filters for case insensitive match _contains_insensitive , _starts_with_insensitive, _ends_with_insensitive #3293
• Mandate everything runs in some fixed locale en_US.UTF8 #3118