a@t400:~$ echo "hello"| sed -e 's/e/ö/g' höllo a@t400:~$ echo "hello"| sed -e 's#e#ö#g' höllo a@t400:~$ echo "hello"| sed -e 's^e^ö^g' höllo
References
http://backreference.org/2010/02/20/using-different-delimiters-in-sed/
a@t400:~$ echo "hello"| sed -e 's/e/ö/g' höllo a@t400:~$ echo "hello"| sed -e 's#e#ö#g' höllo a@t400:~$ echo "hello"| sed -e 's^e^ö^g' höllo
http://backreference.org/2010/02/20/using-different-delimiters-in-sed/