:   '''string index''' ''string charIndex''

Returns the ''charIndex'' 'th character of the ''string'' argument. A ''charIndex'' of 0 corresponds to the first character of the string. ''charIndex'' may be specified as follows:

    :   ''integer'' — The char specified at this integral index.

    :   '''end''' — The last char of the string.

    :   '''end-integer''' — The last char of the string minus the specified integer offset (e.g. '''end-1''' would refer to the "c" in "abcd"). 

If ''charIndex'' is less than 0 or greater than or equal to the length of the string then an empty string is returned.

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Returns for ''index'' an ''integer'', the ''charIndex'''th character in ''string''. If ''index'' is ''end'', the last character in ''string'', and if ''index'' is ''end-integer'', the last character minus the specified offset. (From the Tcl/Tk Reference Guide)

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For example,

   string index "abcde" "3"

returns "d" .  Notice that the index is '''zero''' based - the first character is index 0.

   string index "abcde" "10"

returns "" . There is no 10th character. No error is returned here.

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**See also**
   * [string]
   * [string range]

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