12-24-2008
Thanks to all for the replies.
To matrixmadhan :
Going by your reply -
"It should match zero or more characters in the character class [a-z]
it will match 'a', 'b', 'c' and not the next space character <' '> so just that part is replaced by 'X'"
I tried :-
echo "a 123 abc" | sed 's/[a-z]*/X/'
echo "ab 123 abc" | sed 's/[a-z]*/X/'
echo "abc 123 abc" | sed 's/[a-z]*/X/'
all gave the same output as : X 123 abc
From your reply and the above result I understand - "*" will always start checking from the left in the input string. If it does not find a match , 'X' is replaced at the very beginning of the input string and the job is done.
But if it does find a match , it ends trying to find another match AND 'X' is kept in place of the matched token/characters.
Would request you to please confirm/correct the above.
Thanks
Last edited by sinpeak; 12-24-2008 at 02:12 AM..
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