There are some text search options.
Ignore case: Select this option to ignore whether letters are uppercase or lowercase.
Regular Expression: Select this option to search with regular expression.
Wrap Around: Select this option to search the whole file; otherwise, Xcode searches from the current location of the insertion point to the end of the file.
Contained: Searches for words that contain matching text in a substring.
Starts with: Searches for words that begin with text matching the search term.
Whole words: Searches for words that contain only text matching the contents of the Find field.
Ends with: Searches for words that end with matching text.