append    Append values to variable

binary      Insert and extract fields from binary strings

format      printf() -style string formatting

regexp      Regular expression pattern matching

regsub      Regular expression string substution

scan          sscanf() -style string formatting

 

string compare   Lexical(词汇的) string comparison

string first     Search for first occurrence of substring

string index     Return character from string

string last        Search for last occurance of substring

string length    Return number of characters in string

string range     Return range of characters in string

string tolower   Covert to lowercase

string toupper   Covert to uppercase

string trim          Remove leading and trailing characters

string trimleft      Remove leading characters

string trimright   Remove trailing characters

string wordend   Return end position of word in string

string wordstart  Return start position of word in string

subst                  Blackslash,command,variable substitutions