$re = '/(?m)^(?=(?:(?:(?(1)(?!))(.)|(?(2)(?!))(?!\1)(.)|(?(3)(?!))(?!\1|\2)(.)|(?(4)(?!))(?!\1|\2|\3)(.)|(?(5)(?!))(?!\1|\2|\3|\4)(.)|(?(6)(?!))(?!\1|\2|\3|\4|\5)(.)|(?(7)(?!))(?!\1|\2|\3|\4|\5|\6)(.)|(?(8)(?!))(?!\1|\2|\3|\4|\5|\6|\7)(.)|(?(9)(?!))(?!\1|\2|\3|\4|\5|\6|\7|\8)(.))\S*?){1,9}$)(?=(?:\1|\2|\3|\4|\5|\6|\7|\8|\9)*$)(?(DEFINE)(?<one>(?:(?!\1).)*\1)(?<two>(?:(?!\2).)*\2)(?<three>(?:(?!\3).)*\3)(?<four>(?:(?!\4).)*\4)(?<five>(?:(?!\5).)*\5)(?<six>(?:(?!\6).)*\6)(?<seven>(?:(?!\7).)*\7)(?<eight>(?:(?!\8).)*\8)(?<nine>(?:(?!\9).)*\9))(?:(?(1)(?=(?&one){1}(?!.*\1))(?(2)(?=(?&two){1}(?!.*\2))(?(3)(?=(?&three){1}(?!.*\3))(?(4)(?=(?&four){1}(?!.*\4))(?(5)(?=(?&five){1}(?!.*\5))(?(6)(?=(?&six){1}(?!.*\6))(?(7)(?=(?&seven){1}(?!.*\7))(?(8)(?=(?&eight){1}(?!.*\8))(?(9)(?=(?&nine){1}(?!.*\9)))))))))))|(?(1)(?=(?&one){2}(?!.*\1))(?(2)(?=(?&two){2}(?!.*\2))(?(3)(?=(?&three){2}(?!.*\3))(?(4)(?=(?&four){2}(?!.*\4))(?(5)(?=(?&five){2}(?!.*\5))(?(6)(?=(?&six){2}(?!.*\6))(?(7)(?=(?&seven){2}(?!.*\7))(?(8)(?=(?&eight){2}(?!.*\8))(?(9)(?=(?&nine){2}(?!.*\9)))))))))))|(?(1)(?=(?&one){3}(?!.*\1))(?(2)(?=(?&two){3}(?!.*\2))(?(3)(?=(?&three){3}(?!.*\3))(?(4)(?=(?&four){3}(?!.*\4))(?(5)(?=(?&five){3}(?!.*\5))(?(6)(?=(?&six){3}(?!.*\6))(?(7)(?=(?&seven){3}(?!.*\7))(?(8)(?=(?&eight){3}(?!.*\8))(?(9)(?=(?&nine){3}(?!.*\9)))))))))))|(?(1)(?=(?&one){4}(?!.*\1))(?(2)(?=(?&two){4}(?!.*\2))(?(3)(?=(?&three){4}(?!.*\3))(?(4)(?=(?&four){4}(?!.*\4))(?(5)(?=(?&five){4}(?!.*\5))(?(6)(?=(?&six){4}(?!.*\6))(?(7)(?=(?&seven){4}(?!.*\7))(?(8)(?=(?&eight){4}(?!.*\8))(?(9)(?=(?&nine){4}(?!.*\9)))))))))))|(?(1)(?=(?&one){5}(?!.*\1))(?(2)(?=(?&two){5}(?!.*\2))(?(3)(?=(?&three){5}(?!.*\3))(?(4)(?=(?&four){5}(?!.*\4))(?(5)(?=(?&five){5}(?!.*\5))(?(6)(?=(?&six){5}(?!.*\6))(?(7)(?=(?&seven){5}(?!.*\7))(?(8)(?=(?&eight){5}(?!.*\8))(?(9)(?=(?&nine){5}(?!.*\9)))))))))))|(?(1)(?=(?&one){6}(?!.*\1))(?(2)(?=(?&two){6}(?!.*\2))(?(3)(?=(?&three){6}(?!.*\3))(?(4)(?=(?&four){6}(?!.*\4))(?(5)(?=(?&five){6}(?!.*\5))(?(6)(?=(?&six){6}(?!.*\6))(?(7)(?=(?&seven){6}(?!.*\7))(?(8)(?=(?&eight){6}(?!.*\8))(?(9)(?=(?&nine){6}(?!.*\9)))))))))))|(?(1)(?=(?&one){7}(?!.*\1))(?(2)(?=(?&two){7}(?!.*\2))(?(3)(?=(?&three){7}(?!.*\3))(?(4)(?=(?&four){7}(?!.*\4))(?(5)(?=(?&five){7}(?!.*\5))(?(6)(?=(?&six){7}(?!.*\6))(?(7)(?=(?&seven){7}(?!.*\7))(?(8)(?=(?&eight){7}(?!.*\8))(?(9)(?=(?&nine){7}(?!.*\9)))))))))))|(?(1)(?=(?&one){8}(?!.*\1))(?(2)(?=(?&two){8}(?!.*\2))(?(3)(?=(?&three){8}(?!.*\3))(?(4)(?=(?&four){8}(?!.*\4))(?(5)(?=(?&five){8}(?!.*\5))(?(6)(?=(?&six){8}(?!.*\6))(?(7)(?=(?&seven){8}(?!.*\7))(?(8)(?=(?&eight){8}(?!.*\8))(?(9)(?=(?&nine){8}(?!.*\9)))))))))))|(?(1)(?=(?&one){9}(?!.*\1))(?(2)(?=(?&two){9}(?!.*\2))(?(3)(?=(?&three){9}(?!.*\3))(?(4)(?=(?&four){9}(?!.*\4))(?(5)(?=(?&five){9}(?!.*\5))(?(6)(?=(?&six){9}(?!.*\6))(?(7)(?=(?&seven){9}(?!.*\7))(?(8)(?=(?&eight){9}(?!.*\8))(?(9)(?=(?&nine){9}(?!.*\9)))))))))))).*/';
$str = '------------------------------
match_words =
------------------------------
arraigning
nonordered
abadbacdcacbdbdc
mesosome
ananna
unendued
tromometer
caucasus
intestines
i
deed
horseshoer
happenchance
reappear
deeded
pullup
arraigning
testes
mononymy
scintillescent
couscous
------------------------------
not_match_words =
------------------------------
edified
unreverberating
underpass
interinsert
pilfered
nippiness
gregarinian
deicide
nonaristocratic
rototiller
ozonizing
museums
backbreaker
interradiated
antistalling
naturalize
equitriangular
reparticipate
ppd
miasmas
cabbage
';
preg_match_all($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