Preg split multi SQL by semicolon in PHP

Question

i am trying split my multi SQL by preg, but it doesn works...

Code:

$multiSql = "
ALTER TABLE `my_table` CHANGE `typ` `typ` INT(10) UNSIGNED NOT NULL DEFAULT '0' COMMENT '0=none; 1=test1; 2=test2; 3=test3';

ALTER TABLE `my_table2`
  ADD `date` varchar(25) COLLATE utf8_czech_ci DEFAULT NULL AFTER `test`;
 
ALTER TABLE `my_table3` ADD `date` varchar(25) COLLATE utf8_czech_ci DEFAULT NULL AFTER `test`; ALTER TABLE `my_table3` ADD `test2` varchar(25) COLLATE utf8_czech_ci DEFAULT NULL AFTER `date`;

ALTER TABLE `my_table3` CHANGE `test2` `test2` INT(10) UNSIGNED NOT NULL DEFAULT '0' COMMENT '0=test; 1=test2;';
";

$sqlArray = preg_split('~\([^)]*\)(*SKIP)(*FAIL)(*F)|(?<=;)(?![ ]*$)~', trim($multiSql), -1, PREG_SPLIT_NO_EMPTY);

print_r($sqlArray);

Demo: https://ideone.com/nkvloT

I need output like this:

1. ALTER TABLE `my_table` CHANGE `typ` `typ` INT(10) UNSIGNED NOT NULL DEFAULT '0' COMMENT '0=none; 1=test1; 2=test2; 3=test3';
2. ALTER TABLE `my_table2` ADD `date` varchar(25) COLLATE utf8_czech_ci DEFAULT NULL AFTER `test`;
3. ALTER TABLE `my_table3` ADD `date` varchar(25) COLLATE utf8_czech_ci DEFAULT NULL AFTER `test`;
4. ALTER TABLE `my_table3` ADD `test2` varchar(25) COLLATE utf8_czech_ci DEFAULT NULL AFTER `date`;
5. ALTER TABLE `my_table3` CHANGE `test2` `test2` INT(10) UNSIGNED NOT NULL DEFAULT '0' COMMENT '0=test; 1=test2;';

I am using this pattern from diferend answer: ~\([^)]*\)(*SKIP)(*FAIL)(*F)|(?<=;)(?![ ]*$)~ But it not works for my code.

Thanks for any help.

Answer 1

The pattern can be written using a positive lookahead asserting whitespace chars until the end of the string instead.

You can also just use one of the two notations (*FAIL)(*F) instead of both.

\([^)]*\)(*SKIP)(*F)|(?<=;)(?=\h*$|\s*\bALTER TABLE\b)

Regex demo | PHP demo

Example

$multiSql = "
ALTER TABLE `my_table` CHANGE `typ` `typ` INT(10) UNSIGNED NOT NULL DEFAULT '0' COMMENT '0=none; 1=test1; 2=test2; 3=test3';

ALTER TABLE `my_table2`
  ADD `date` varchar(25) COLLATE utf8_czech_ci DEFAULT NULL AFTER `test`;
 
ALTER TABLE `my_table3` ADD `date` varchar(25) COLLATE utf8_czech_ci DEFAULT NULL AFTER `test`; ALTER TABLE `my_table3` ADD `test2` varchar(25) COLLATE utf8_czech_ci DEFAULT NULL AFTER `date`;

ALTER TABLE `my_table3` CHANGE `test2` `test2` INT(10) UNSIGNED NOT NULL DEFAULT '0' COMMENT '0=test; 1=test2;';
";

$sqlArray = array_map(function($x){
    return trim(preg_replace("/\R/", '', $x));
}, preg_split('~\([^)]*\)(*SKIP)(*F)|(?<=;)(?=\h*$|\s*\bALTER TABLE)~m', trim($multiSql), -1, PREG_SPLIT_NO_EMPTY));

print_r($sqlArray);

Output

Array
(
    [0] => ALTER TABLE `my_table` CHANGE `typ` `typ` INT(10) UNSIGNED NOT NULL DEFAULT '0' COMMENT '0=none; 1=test1; 2=test2; 3=test3';
    [1] => ALTER TABLE `my_table2`  ADD `date` varchar(25) COLLATE utf8_czech_ci DEFAULT NULL AFTER `test`;
    [2] => ALTER TABLE `my_table3` ADD `date` varchar(25) COLLATE utf8_czech_ci DEFAULT NULL AFTER `test`;
    [3] => ALTER TABLE `my_table3` ADD `test2` varchar(25) COLLATE utf8_czech_ci DEFAULT NULL AFTER `date`;
    [4] => ALTER TABLE `my_table3` CHANGE `test2` `test2` INT(10) UNSIGNED NOT NULL DEFAULT '0' COMMENT '0=test; 1=test2;';
)