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- csubstr string firstExpr lengthExpr
- Returns a range of characters from string starting at
- the character indexed by the expression firstExpr
- (zero-based) for lengthExpr characters. The special
- keyword end may be specified for lengthExpr to indicate
- that the remainder of the string is to be extracted.
- This command is a short cut for:
-
- string range string [expr firstExpr] [expr length-1]
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