Tcl/Tk 8.5 Programming Cookbook

Replacing ranges of characters contained within a string

Should it become necessary to replace the values stored in a string, regardless of contents, Tcl has provided the replace keyword.

The syntax of the string command is as follows:

string replace string first last replacement

How to do it…

In the following example, we will replace the characters stored in a string with new values. Return values from the commands are provided for clarity. Enter the following command:

% string replace abcdefg 2 5 123456789
ab123456789g

How it works…

Tcl has returned a new string containing the characters located within the index range, from 2 to 5. This illustrated not only the replacement of the characters, but also the command's ability to create strings that ...