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Is it possible to replace a character in a string with a polygon?

 
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Hello.

I was wondering if it was possible to replace a character with a polygon, in any instance of that character's occurrence in a string?
For example, if I typed-in the word 'Holly' and hit 'enter', the first letter would be replaced by the polygon.
If I then went to type the word 'thistle', the polygon's new position would be in place of the second letter?

This is my code fragment, the character I want to replace is called sl1.



Any help/guidance will be greatly appreciated.
 
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