lua_sting详解（lua_sting详解）.docVIP

lua_sting详解（lua_sting详解） The LUA string library. 1. string library all the character index is 1,2 from front to back,...; after the move from -1, -2,... 2. string library all the function are not the direct operation of the string, but returns a result S = [abc] String.len (s) == returns 5 String.rep (ABC, 2) == returns abcabc String.lower (ABC) == returns abc String.upper (ABC) == returns ABC String.sub (s, 2) == returns abc] String.sub (s, -2) == returns c] String.sub (s, 2, -2) == returns abc String.format (FMT,...) returns a formatted string like printf String.find (s, pattern, POS) First parameters: the source string Second parameters: to search the pattern string Third parameters: A hint, start the search from the POS position Find matching returns: string matching start and end position, otherwise it returns nil Simple pattern string S = Hello world I, j = string.find (s, hello) Print (I, J) - 15 Print (string.sub (s, I, J) - Hello) Print (string.find (s, world) - 711) I, j = string.find (s, l) Print (I, J) - 33 Print (string.find (s, LLL) - Nil) The format pattern string S = Deadline is 30/05/1999, firm Date = %d%d/%d%d/%d%d%d%d Print (string.sub (s, string.find (s, date) - 30/05/1999)) The following table lists all the class Lua support: Any character. %s whitespace %p punctuation characters %c control character %d digital Sixteen hexadecimal numbers%x %z on behalf of 0 characters The letter%a %l lowercase letters %u capital letters %w letters and numbers Said the complement of a set represented by lowercase uppercase character class above. For example,%Anon alphanumeric characters: Special characters in the string mode (%). [$^ + - *? As a special character % escape character %.matching point; %%character%. The escape character % can be used not only to escape special characters, but also can be used for all non alphabetic characters. When in doubt about a character, for security reasons please use an escape character escapes him. Create a character