Replacing unauthorized characters with space

Hi friends,
There is a set of authorized characters. The authorized characters are
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789<space>
If any character other than these characters should be replaced with space.
For example, "I like foot-ball" should be changed to "I like foot ball"
"Where are you?" should be changed to "Where are you"
"red / blue" should be changed to "red blue"
I use Oracle 11.2.
Thanks in advance!

Using regular expression you can do this.
SQL> with t
2 as
3 (
4 select 'I like foot-ball' str
5    from dual
6 )
7 select str
8       , regexp_replace(str, '[^a-z0-9[:space:]]', ' ', 1, 0, 'i') new_str
9    from t;
STR              NEW_STR
I like foot-ball I like foot ball
You can read more about regular expression from the document.
Using Regular Expressions in Oracle Database
Message was edited by: Karthick_Arp
Edited the Pattern after seeing franks post.

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