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INPUT:

 $ echo -e 'AAAART5530408XXXX\nAAAAZE6530408XXXX\nAAAART12345678XXXX'
AAAART5530408XXXX
AAAAZE6530408XXXX
AAAART12345678XXXX
$

OUTPUT:

 $ echo -e 'AAAART5530408XXXX\nAAAAZE6530408XXXX\nAAAART12345678XXXX' | sed -e 's/\(AAAA[A-Z]\{2\}[0-9]\{7\}\)XXXX/\n\1/g'

AAAART5530408

AAAAZE6530408
AAAART12345678XXXX
$   

How can I extend the:

sed -e 's/\(AAAA[A-Z]\{2\}[0-9]\{7\}\)XXXX/\n\1/g'

sed oneliner, so that it would optionally accept

sed -e 's/\(AAAA[A-Z]\{2\}[0-9]\{8\}\)XXXX/\n\1/g'

8 numbers too? (not just 7) Is it possible with only 1 sed?

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up vote 1 down vote accepted

The \{7\} construct is a simple case of the \{m,n\} for "match at least m and at most n, in your case it'll be:

sed -e 's/\(AAAA[A-Z]\{2\}[0-9]\{7,8\}\)XXXX/\n\1/g'

Perhaps a simple:

sed -s 's/XXXX//g'

is enough in your case?

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