matching pattern to new line

Question

move <acd> to new line and values after </acd> to new line

Input File:

abcd<acd>aghjdkadlkh</acd> <bud> dghakj </bud>

expected Output:

abcd
<acd>
aghjdkadlkh
</acd>
<bud>dghakj</bud>

Answer 1

sed with ERE (-E):

sed -E 's#</?acd>#\n&\n#g'

• s#</?acd>#\n&\n#g substitutes <acd> and </acd> with newlines before and after the pattern

After the operation, to get rid of the leading space of <bud> dghakj </bud> removed too, tack a tiny sed:

sed -E 's#</?acd>#\n&\n#g' ... | sed 's/^ //'

Example:

% sed -E 's#</?acd>#\n&\n#g' <<<'abcd<acd>aghjdkadlkh</acd> <bud> dghakj </bud>' 
abcd
<acd>
aghjdkadlkh
</acd>
 <bud> dghakj </bud>

% sed -E 's#</?acd>#\n&\n#g' <<<'abcd<acd>aghjdkadlkh</acd> <bud> dghakj </bud>' | sed 's/^ //'
abcd
<acd>
aghjdkadlkh
</acd>
<bud> dghakj </bud>