regex - preg_split string with negative look-behind assertion php -


this array have 

 array     (          [0] =>                  string@:abc:-------:abc         [1] =>                  string@:abc:xyz-----:abc         [2] =>               string1:string2:abc:xyz-----:abc                                        [3] =>               string2:string3:abc:xyz-----:abc                  )

i want split these offset 

array (     [0] => array         (             [1st] =>                  string@             [2nd] => abc             [3rd] => ------             [4th] => abc         )     [1] => array         (             [1st] =>                  string@             [2nd] => abc             [3rd] => xyz             [4th] => abc         )      [2] => array         (             [1st] =>                  string1             [2nd] => string2             [3rd] => abc             [4th] => xyz             [5th]=> abc         )      [3] => array         (             [1st] =>                  string2             [2nd] => string3             [3rd] => abc             [4th] => xyz             [5th]=> abc         )  )

my problem in 2,3 array string1 , string2 coming in diff offset want this

[0] => array         (             [1st] =>     string1:string2             [2rd] => abc             [3th] => xyz             [4th]=> abc         )   [1] => array         (             [1st] =>     string2:string3             [2rd] => abc             [3th] => xyz             [4th]=> abc         )

but there 2 special char @ nd : if in string1 @ not there want split start ,if @ not there want start after string2 please help

you can use negative lookbehind:

$arr = preg_split('/(?<!(?:string1|string2)):/', 'string1:string2:abc:xyz-----:abc'); var_dump($arr);

output:

array(4) {   [0]=>   string(15) "string1:string2"   [1]=>   string(3) "abc"   [2]=>   string(8) "xyz-----"   [3]=>   string(3) "abc" }

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