SCO Visual Tcl Reference Guide
Chapter 2, TclX - the Extended Tcl language

String and character manipulation commands (TCLX)

String and character manipulation commands (TCLX)

These commands provide additional functionality to classify characters, convert characters between character and numeric values, convert an index into a string, determine the length of a string, extract a range of characters from a string, replicate a string a number of times, and transliterate a string (similar to the UNIX tr(C) program).

See the manual pages for the following commands: