**String Subcommands - length index range**


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Tcl commands often have "subcommands". The `string` command is an example of one of these.  The `string` command treats its first argument as a subcommand.  Utilizing subcommands is a good way to make one command do multiple things without using cryptic names.  For instance, Tcl has `string length` instead of, say, `slength`.

Here we cover these string subcommands:

   `string length str`:    Returns the length of `str`.

   `string index str i`:    Returns the `i`'th character from `str`.

   `string range str first last`:    Returns a string composed of the characters from `first` to `last` taken from `str`.



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***Example***

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set string "this is my test string"

puts "There are [string length $string] characters in \"$string\""

puts "[string index $string 1] is the second character in \"$string\""
puts "Second character in \"$string\" is [string index $string 1]"

puts "Substring from 5th to 10th: \"[string range $string 5 10]\""
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<<discussion>> Resulting output
======none
There are 22 characters in "this is my test string"
Second character in "this is my test string" is h
Substring from 5th to 10th: "is my"
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<<enddiscussion>>

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