Unless otherwise specified by a user, upper and lower case letters should be treated as equivalent in searching text.
Additional Information:
For example, "STRING," "String," and "string" should all be recognized/accepted by the computer when searching for that word. In searching for words, users will generally be indifferent to any distinction between upper and lower case. The computer should not compel a distinction that users do not care about and may find difficult to make. The computer should also ignore such other features as bolding, underlining, parentheses, and quotes when searching text.