Search anywhere in a string with INSTR function

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Suppose you have a table X with the following data and you want to search for a particular string in its columns.

SQL>SELECT * FROM X;registration_origin

-------------------
aaa.bbbbb
ccccccc.dd
f.eeeeeeee

You can change this data using

SQL> SELECT REPLACE(SUBSTR(REGISTRATION_ORIGIN, 0, INSTR(REGISTRATION_ORIGIN, '.')), '.', ' ') FROM X
/

to this

registration_origin
-------------------
aaa
ccccccc
f