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Encode and display character using hex code

Thanks to J. Lakeman

The tilde is a special character in Powerbuilder used as an escape character in a string. 

// prints copyright sign and "A" "B"
String ls_string = "This a test ~h40 ~h41 ~h42"
Messagebox("hex", ls_string)

// prints copyright sign and "A" "B"
ls_string = "This a test ~064 ~065 ~066"
Messagebox("decimal", ls_string)

// prints a tilde
ls_string = "This a test ~~"
Messagebox("tilde", ls_string)
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