Ask a regular match about the problem

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$neirong = ' aaaaaaaaaaaaaa la la la ddddddddddddddd ';

Ask how to use the regular matching function preg_replace, the content of the ' La La la de ', leaving only the characters.
Note: The link ' 1.html ' and ' La la la ' are randomly appearing
------to solve the idea----------------------

echo preg_replace (' # #s ', ', $neirong);

------to solve the idea----------------------

    
 
 
    $string = ' aaaaaaaaaaaaaa la la la ddddddddddddddd ';

echo preg_replace ('/(. *) <\/a>/ui ', ' \1 ', $string);  

    ?>

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