csubstr(TCLX)

csubstr(TCLX)
csubstr -- return a substring of characters from string

Syntax

csubstr string firstExpr lengthExpr

Description

Returns a range of characters from string starting at the character indexed by the expression firstExpr (zero-based) for lengthExpr characters.

If the expression firstExpr or lengthExpr starts with the string ``end'', then ``end'' is replaced with the index of the last character in the string. If the expression starts with ``len'', then ``len'' is replaced with the length of the string.