filter tag from contain text with regex

i try filter a text that contain html tags , i want filter <a> tags from inner text of <a> i try

string:

<li><a href='abc'>one</a></li><li><a href='cde'>two tag</a></li><a href='fgh'>tag three</a></li><a href='ijk'>four</a></li>

php :

preg_match_all("/\<a.*?href(?:\=|\s\=)(?:\\"|\')(.*?)(?:\\"|\').*?\>[^\/]*tag\<\/a\>/", $input_lines, $output_array);

result :

array(1
0   =>  abc
)

correct answer is like below

array(1
0   =>  cde,
1   =>  fgh
)

what is wrong and how can get correct result

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