Partial column updates

Is it possible to update only the first 25 characters of a certain column in a table. The current value of the first 25 characters is identical and the new value replacing them will also be identical across all rows of th table. Can I use substr or some function like that in the UPDATE statetment?
Example : old value: /Test/Junk/BBall.ksh -mkt -fgt
new value: /Test/Sports/BBall.ksh -mkt -fgt

Fish,
your solution does not work correctly
SQL> select old_string, '/Test/Sports/BBall.ksh'||substr(old_string,26,length(old_string)-25) new_string
2 from (select '/Test/Junk/BBall.ksh -mkt -fgt' old_string from dual);
OLD_STRING NEW_STRING
/Test/Junk/BBall.ksh -mkt -fgt /Test/Sports/BBall.ksh -fgtAnother solution would be to replace the old string with the new one
SQL> select old_string, replace(old_string, '/Test/Junk/BBall.ksh', '/Test/Sports/BBall.ksh') new_string
2 from (select '/Test/Junk/BBall.ksh -mkt -fgt' old_string from dual);
OLD_STRING
NEW_STRING
/Test/Junk/BBall.ksh -mkt -fgt
/Test/Sports/BBall.ksh -mkt -fgt

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