in reply to How to remove all repeating characters in a string in place

Hi,
...or any other way to do this ?

What about using tr/// you can do perldoc -f tr on your CLI to read the documentation.
The following works like you wanted: 

perl -we "$ARGV[0]=~tr[abf]()ds; print $ARGV[0]" aaabbcdeffgh   # prin
+ts cdegh

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