Php pcre regex to parse SQL with delimiters/comments

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Perl

PHP

MySQL

regular-expression

i am trying to use regular expressions to extract singular sql statements from a file containing several sql statements and alternate delimiters/comments.

i am trying to match the following patterns to isolate sql statements, then after isolating an individual statement, stripping it of comments:
"delimiter (del) (nonwhitespace sequence) (not (del) or comment with (del)) (del)"
"(not ; ) ;"

the first pattern should allow the use of any set of characters for a delimiter

What I have tried:

i tried the following to match the first pattern:
"/\s*delimiter\s+(?<d>[^\s]+)\s*;?\s*(?<qstr>(((?!--|\g{d}).)*|--[^\R]*\R)+)\g{d}\s*;?/s"

and if the first pattern fails, to match the second pattern:
"/\s*(?<qstr>(((?!--|;).)+|--[^\R]*\R)*);/s"
to match the second case

then if either succeeds, replace the following with empty string:
"/--[^\n\r]*(?:\n|\r)+/"

my problem is that apache crashes on preg_match when i try to search for either of the first 2 regular expressions on the following string:
"delimiter $$
create table MovieDetail
(
imdbid varchar(32) primary key not null,
title varchar(512),
year int,
rated varchar(16),
released int,
runtime int,
director varchar(128),
writer varchar(12),
plot varchar(2048),
imageurl varchar(512),
rating float,
ratingcount int,
type varchar(64)
); $$
detect this text as a separate statement"

i tried replacing escape sequences with // like //s and //g and it still crashes just the same

i'm using XAMPP with Apache 2.4.17 and PHP 5.6.23 (VC11 X86 32bit thread safe) + PEAR

i tried testing them on debugex.com and both expressions are valid.

major update: it seems as if the problem only manifests itself when i use run the expressions on multi-line strings, so i'm going to try comparing the binary data of 2 strings where i replace the line break with \n or \r\n

update: the problem seems to occur only with multiple whitespace characters.