Removing non-alphanumeric characters with sed

tr's -c (complement) flag may be an option

echo "Â10.41.89.50-._ " | tr -cd '[:alnum:]._-'

regex bash sed replace

You might want to use the [:alpha:] class instead:

echo "Â10.41.89.50 " | sed "s/[[:alpha:].-]//g"

should work. If not, you might need to change your local settings.

On the other hand, if you only want to keep the digits, the hyphens and the period::

echo "Â10.41.89.50 " | sed "s/[^[:digit:].-]//g"

If your string is in a variable, you can use pure bash and parameter expansions for that:

$ dirty="Â10.41.89.50 "$ clean=${dirty//[^[:digit:].-]/}$ echo "$clean"10.41.89.50

$ dirty="Â10.41.89.50 "$ clean=${dirty//[[:alpha:]]/}$ echo "$clean"10.41.89.50

You can also have a look at 1_CR's answer.

regex bash sed replace

Well sed won't support unicode characters. Use perl instead:

> s="Â10.41.89.50 "> perl -pe 's/[^\w.-]+//g' <<< "$s"10.41.89.50

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