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 edit

• string
• string range

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