$re = '/match ([^\s=]+) = ([^;]+); // MATCH/m';
$str = 'some random strings that are not \'hstep\' form
...
match hstep1_num00 = {eau,t,nb,v,d}; // MATCH
match hstep1_num01 = {c,bul,kv,e}; // MATCH
...
match hstep3_num00 = {u_ku,b,ntv,q}; // MATCH
match hstep3_num01 = {qq,rask,cb_p}; // MATCH
match hstep3_num02 = {c,a,ha,w,ykl}; // MATCH
match hstep3_num03 = {p,gu,enb_q_b,z,d}; // MATCH
...
some random strings that are not \'hstep\' form
';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php